Index: trunk/psphot/src/psphotModelGroupInit.c
===================================================================
--- trunk/psphot/src/psphotModelGroupInit.c	(revision 6571)
+++ trunk/psphot/src/psphotModelGroupInit.c	(revision 7505)
@@ -13,5 +13,6 @@
 { 
 
-    pmModelGroupInit ();
+    // if pmModelGroupInit returns false, we have already init-ed
+    if (!pmModelGroupInit ()) return;
 
     int Nmodels = sizeof (userModels) / sizeof (pmModelGroup);