Index: trunk/psphot/src/psphotMosaicChip.c
===================================================================
--- trunk/psphot/src/psphotMosaicChip.c	(revision 12633)
+++ trunk/psphot/src/psphotMosaicChip.c	(revision 12634)
@@ -25,7 +25,8 @@
     }
 
+    // mosaic the chip, forcing a deep copy (resulting images are not subimages)
     psTrace("pmChipMosaic", 5, "mosaic chip %s to %s (xbin,ybin: %d,%d to %d,%d)\n",
             in->name, out->name, in->xBin, in->yBin, out->xBin, out->yBin);
-    status = pmChipMosaic(outChip, inChip);
+    status = pmChipMosaic(outChip, inChip, true);
     return status;
 }