--- ptraj.c	2010-04-19 08:24:36.125000000 -0400
+++ ptraj.c	2010-04-19 08:12:45.609375000 -0400
@@ -7398,8 +7398,12 @@
     if (action->type != TRANSFORM_NOOP &&
 	action->type != TRANSFORM_TRANSFORM) {
 
-      // Update maxFrames of each action with # sets actually processed
-      action->state->maxFrames = processed;
+      /* Update maxFrames of each action with # sets actually processed
+       * Only do this if unable to calculate the total number of frames,
+       * by definition this means this is not an MPI run.
+       */
+      if (action->state->maxFrames<0)
+        action->state->maxFrames = processed;
       for (i=0; i<6; i++)
 	boxnew[i] = box[i];
       action->fxn(action, X, Y, Z, boxnew, PTRAJ_PRINT);