Index: trunk/psphot/src/psphotImageLoop.c
===================================================================
--- trunk/psphot/src/psphotImageLoop.c	(revision 33691)
+++ trunk/psphot/src/psphotImageLoop.c	(revision 34086)
@@ -164,4 +164,5 @@
     pmFPAfileActivate (config->files, true, "PSPHOT.EXPNUM");
     while ((chip = pmFPAviewNextChip (view, input->fpa, 1)) != NULL) {
+        if (! chip->process || ! chip->file_exists) { continue; }
         if (!pmFPAfileIOChecks (config, view, PM_FPA_BEFORE)) ESCAPE ("failed attempting to load EXPNUM input for Chip in psphot.");
         while ((cell = pmFPAviewNextCell (view, input->fpa, 1)) != NULL) {