Index: trunk/psphot/src/psphotSetup.c
===================================================================
--- trunk/psphot/src/psphotSetup.c	(revision 5828)
+++ trunk/psphot/src/psphotSetup.c	(revision 5986)
@@ -17,4 +17,7 @@
 
     psTimerStart ("psphot");
+
+    // load implementation-specific models
+    psphotModelGroupInit ();
 
     // setup header template, specify COMMENT and HISTORY as MULTI