diff --git a/regtest/adjmat/rt-dfg-wcsurf/Makefile b/regtest/adjmat/rt-dfg-wcsurf/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3703b27cea227aa053fb6d1d73f861e4384dbcee
--- /dev/null
+++ b/regtest/adjmat/rt-dfg-wcsurf/Makefile
@@ -0,0 +1 @@
+include ../../scripts/test.make
diff --git a/regtest/adjmat/rt-dfg-wcsurf/config b/regtest/adjmat/rt-dfg-wcsurf/config
new file mode 100644
index 0000000000000000000000000000000000000000..999b209af907e501185cf7868b3f2b41de44141d
--- /dev/null
+++ b/regtest/adjmat/rt-dfg-wcsurf/config
@@ -0,0 +1,4 @@
+mpiprocs=1
+type=driver
+# this is to test a different name
+arg="--plumed plumed.dat --ixyz traj.xyz --length-units A --box 28.66,28.66,28.66"
diff --git a/regtest/adjmat/rt-dfg-wcsurf/plumed.dat b/regtest/adjmat/rt-dfg-wcsurf/plumed.dat
new file mode 100644
index 0000000000000000000000000000000000000000..8a89ab0b372e37bd51cc7d94ce3646acfeece19f
--- /dev/null
+++ b/regtest/adjmat/rt-dfg-wcsurf/plumed.dat
@@ -0,0 +1,9 @@
+c1: COORDINATIONNUMBER SPECIES=1-1996 SWITCH={CUBIC D_0=0.34 D_MAX=0.38}
+cf: MFILTER_LESS DATA=c1 SWITCH={CUBIC D_0=13 D_MAX=13.5} 
+mat: CONTACT_MATRIX ATOMS=cf WTOL=0.01 SWITCH={CUBIC D_0=0.34 D_MAX=0.38}
+dfs: DFSCLUSTERING MATRIX=mat 
+clust1: CLUSTER_PROPERTIES CLUSTERS=dfs CLUSTER=1 
+
+# DUMPMULTICOLVAR DATA=clust1 ORIGIN=1 UNITS=A FILE=atoms.xyz 
+# MULTICOLVARDENS DATA=clust1 ORIGIN=1 DIR=xyz NBINS=30,30,30 BANDWIDTH=1.0,1.0,1.0 RUN=1 OFILE=dens.cube
+WCSURFACE DATA=clust1 ORIGIN=1 FILE=surface.xyz NBINS=30,30,30 BANDWIDTH=1.0,1.0,1.0 UNITS=A CONTOUR=250.0 PRECISION=4 
diff --git a/regtest/adjmat/rt-dfg-wcsurf/surface.xyz.reference b/regtest/adjmat/rt-dfg-wcsurf/surface.xyz.reference
new file mode 100644
index 0000000000000000000000000000000000000000..289eb8fb36a612575e1dd8bd32b81d23da808586
--- /dev/null
+++ b/regtest/adjmat/rt-dfg-wcsurf/surface.xyz.reference
@@ -0,0 +1,678 @@
+676
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diff --git a/regtest/adjmat/rt-dfg-wcsurf/traj.xyz b/regtest/adjmat/rt-dfg-wcsurf/traj.xyz
new file mode 100644
index 0000000000000000000000000000000000000000..0a25c6889ec36b99e5a3ecc523cc1579f2ce8d78
--- /dev/null
+++ b/regtest/adjmat/rt-dfg-wcsurf/traj.xyz
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+  1         14.319000        5.800000        5.840000
+  1         12.922000        4.278000        7.186000
+  1         14.369000        5.802000        8.696000
+  1         12.876000        4.376000       10.101000
+  1         14.438000        5.793000       11.532000
+  1         12.935000        4.255000       12.830000
+  1         14.346000        5.767000       14.228000
+  1         12.791000        7.268000      -12.813000
+  1         14.370000        8.592000      -11.453000
+  1         12.830000        7.213000      -10.055000
+  1         14.292000        8.466000       -8.545000
+  1         12.787000        7.209000       -7.188000
+  1         14.240000        8.635000       -5.709000
+  1         12.766000        7.109000       -4.177000
+  1         14.356000        8.586000       -2.785000
+  1         12.805000        7.245000       -1.405000
+  1         14.351000        8.611000        0.055000
+  1         12.874000        7.130000        1.395000
+  1         14.267000        8.508000        2.888000
+  1         12.940000        7.088000        4.290000
+  1         14.301000        8.545000        5.816000
+  1         12.876000        7.129000        7.216000
+  1         14.312000        8.635000        8.505000
+  1         12.777000        7.145000       10.079000
+  1         14.322000        8.675000       11.417000
+  1         13.000000        7.263000       12.916000
+  1         14.335000        8.641000       14.399000
+  1         12.819000       10.020000      -12.942000
+  1         14.287000       11.483000      -11.465000
+  1         12.855000        9.948000       -9.978000
+  1         14.328000       11.434000       -8.552000
+  1         12.759000       10.062000       -7.242000
+  1         14.094000       11.534000       -5.813000
+  1         12.867000       10.015000       -4.257000
+  1         14.316000       11.472000       -2.816000
+  1         12.937000       10.053000       -1.337000
+  1         14.408000       11.540000        0.044000
+  1         12.788000        9.983000        1.291000
+  1         14.384000       11.425000        2.909000
+  1         12.975000        9.975000        4.390000
+  1         14.315000       11.367000        5.656000
+  1         12.863000       10.059000        7.114000
+  1         14.371000       11.261000        8.572000
+  1         12.807000       10.049000        9.942000
+  1         14.254000       11.605000       11.550000
+  1         12.898000       10.214000       12.796000
+  1         14.324000       11.507000       14.329000
+  1         12.865000       12.879000      -12.838000
+  1         14.328000       14.242000      -11.425000
+  1         12.805000       12.811000       -9.984000
+  1         14.305000       14.428000       -8.659000
+  1         12.802000       13.006000       -7.228000
+  1         14.376000       14.313000       -5.661000
+  1         12.975000       12.947000       -4.188000
+  1         14.496000       14.442000       -2.870000
+  1         12.995000       12.917000       -1.409000
+  1         14.389000       14.323000        0.028000
+  1         13.036000       12.873000        1.450000
+  1         14.323000       14.392000        2.900000
+  1         12.936000       12.860000        4.260000
+  1         14.229000       14.297000        5.808000
+  1         12.856000       12.835000        7.173000
+  1         14.303000       14.317000        8.558000
+  1         12.874000       12.893000       10.033000
+  1         14.267000       14.385000       11.499000
+  1         12.833000       13.012000       13.007000
+  1         14.331000       14.292000       14.332000
diff --git a/src/adjmat/ClusterAnalysisBase.cpp b/src/adjmat/ClusterAnalysisBase.cpp
index 1b92aca9d32000f25200d859237f9c97fb947778..d6a2decbf8fe94539150121328eedc21bda95c27 100644
--- a/src/adjmat/ClusterAnalysisBase.cpp
+++ b/src/adjmat/ClusterAnalysisBase.cpp
@@ -35,6 +35,8 @@ Action(ao),
 MultiColvarFunction(ao),
 myclusters(NULL)
 {
+  // This makes these colvars behave appropriately with dump and analysis
+  usespecies=true;
   // Find what action we are taking the clusters from
   std::vector<std::string> matname(1); parse("CLUSTERS",matname[0]);
   bool found_cluster=interpretInputMultiColvars(matname,0.0);
diff --git a/src/multicolvar/DumpMultiColvar.cpp b/src/multicolvar/DumpMultiColvar.cpp
index 1b95ea8b2335ae4073874712db41c0a4d0304dda..a5f75c5731535f86813e42c3b9f884c9b42aaa6a 100644
--- a/src/multicolvar/DumpMultiColvar.cpp
+++ b/src/multicolvar/DumpMultiColvar.cpp
@@ -145,7 +145,7 @@ DumpMultiColvar::DumpMultiColvar(const ActionOptions&ao):
 }
 
 void DumpMultiColvar::update(){
-  of.printf("%u\n",mycolv->getFullNumberOfTasks());
+  of.printf("%u\n",mycolv->getCurrentNumberOfActiveTasks());
   const Tensor & t(mycolv->getPbc().getBox());
   if(mycolv->getPbc().isOrthorombic()){
     of.printf((" "+fmt_xyz+" "+fmt_xyz+" "+fmt_xyz+"\n").c_str(),lenunit*t(0,0),lenunit*t(1,1),lenunit*t(2,2));
@@ -162,6 +162,7 @@ void DumpMultiColvar::update(){
   for(unsigned i=0;i<mycolv->getFullNumberOfTasks();++i){
     const char* defname="X";
     const char* name=defname;
+    if( !mycolv->taskIsCurrentlyActive(i) ) continue;
 
     Vector apos = mycolv->getCentralAtomPos( mycolv->getTaskCode(i) );
     if( getNumberOfAtoms()>0 ) apos=pbcDistance( apos, getPosition(0) );
diff --git a/src/multicolvar/MultiColvarDensity.cpp b/src/multicolvar/MultiColvarDensity.cpp
index 1a9bb94f30bd77e11fb4431158c675e3fa79e7a2..369960a46d4a45f93b65aa3e3e3e9b3ea92ca8f9 100644
--- a/src/multicolvar/MultiColvarDensity.cpp
+++ b/src/multicolvar/MultiColvarDensity.cpp
@@ -219,6 +219,9 @@ void MultiColvarDensity::update(){
   plumed_dbg_assert( stash ); std::vector<double> cvals( mycolv->getNumberOfQuantities() );
   Vector origin = getPosition(0); std::vector<double> pp( directions.size() ); Vector fpos;
   for(unsigned i=0;i<mycolv->getFullNumberOfTasks();++i){
+      // Skip if task was not active on last run through
+      if( !mycolv->taskIsCurrentlyActive(i) ) continue ;
+
       stash->retrieveValue( i, false, cvals );
       Vector apos = pbcDistance( mycolv->getCentralAtomPos( mycolv->getTaskCode(i) ), origin );
       if( fractional ){ fpos = getPbc().realToScaled( apos ); } else { fpos=apos; }
@@ -239,7 +242,7 @@ void MultiColvarDensity::update(){
          // Cube files are in au so I convert from "Angstrom" to AU so that when
          // VMD converts this number back to Angstroms (from AU) it looks right
          if( plumed.getAtoms().usingNaturalUnits() ) gg->writeCubeFile( gridfile, 1.0/0.5292 );  
-         else gg->writeCubeFile( gridfile, plumed.getAtoms().getUnits().getLength()/5.929 );
+         else gg->writeCubeFile( gridfile, plumed.getAtoms().getUnits().getLength()/.05929 );
       } else gg->writeToFile( gridfile ); 
       gridfile.close();
 
diff --git a/src/multicolvar/WillardChandlerSurface.cpp b/src/multicolvar/WillardChandlerSurface.cpp
index 96bea6080bd8e1f044eb60cc1cfd12e47375762b..01fd4f7aa95106928e5620bfdae7ec84625f5847 100644
--- a/src/multicolvar/WillardChandlerSurface.cpp
+++ b/src/multicolvar/WillardChandlerSurface.cpp
@@ -179,6 +179,9 @@ void WillardChandlerSurface::update(){
   unsigned rank=comm.Get_rank(), size=comm.Get_size();
 
   for(unsigned i=rank;i<mycolv->getFullNumberOfTasks();i+=size){
+      // Skip if task was not active on last run through
+      if( !mycolv->taskIsCurrentlyActive(i) ) continue ;
+
       stash->retrieveValue( i, false, cvals );
       Vector apos = pbcDistance( mycolv->getCentralAtomPos( mycolv->getTaskCode(i) ), origin );
 
diff --git a/src/vesselbase/ActionWithVessel.h b/src/vesselbase/ActionWithVessel.h
index e7fc0af4b1dba896146d5b5efa72005f4e0f897f..c0e50420a4f62994f054f625b3548592d52dcca0 100644
--- a/src/vesselbase/ActionWithVessel.h
+++ b/src/vesselbase/ActionWithVessel.h
@@ -131,12 +131,8 @@ protected:
   bool usingLowMem() const ;
 /// Set that we are using low memory
   void setLowMemOption(const bool& );
-/// Get the number of tasks that are currently active
-  unsigned getCurrentNumberOfActiveTasks() const ;
 /// Get the ith of the currently active tasks
   unsigned getActiveTask( const unsigned& ii ) const ;
-/// Check whether or not a particular task is currently active
-  bool taskIsCurrentlyActive( const unsigned& index ) const ;
 /// Deactivate all the tasks in the task list
   void deactivateAllTasks();
 /// Deactivate all tasks with i in lower \f$\le\f$  i < upper
@@ -151,6 +147,10 @@ public:
   ~ActionWithVessel();
   void unlockContributors();
   void lockContributors();
+/// Get the number of tasks that are currently active
+  unsigned getCurrentNumberOfActiveTasks() const ;
+/// Check whether or not a particular task is currently active
+  bool taskIsCurrentlyActive( const unsigned& index ) const ;
   virtual void finishTaskListUpdate(){};
 /// Activate the jth colvar
 /// Deactivate the current task in future loops