Index: trunk/ppSub/src/ppSubMatchPSFs.c
===================================================================
--- trunk/ppSub/src/ppSubMatchPSFs.c	(revision 26982)
+++ trunk/ppSub/src/ppSubMatchPSFs.c	(revision 27088)
@@ -340,4 +340,8 @@
         psImageCovarianceTruncate(refRO->covariance, COVAR_FRAC);
     }
+
+    // Data doesn't exist until it's created in pmSubtraction...
+    inConv->data_exists = inConv->parent->data_exists = inConv->parent->parent->data_exists = false;
+    refConv->data_exists = refConv->parent->data_exists = refConv->parent->parent->data_exists = false;
 
     // Match the PSFs