Index: /trunk/Ohana/src/relphot/src/setMrelCatalog.c
===================================================================
--- /trunk/Ohana/src/relphot/src/setMrelCatalog.c	(revision 42550)
+++ /trunk/Ohana/src/relphot/src/setMrelCatalog.c	(revision 42551)
@@ -274,6 +274,10 @@
 
       // the flat-field correction is stored in measure.Mflat
-      //Mflat = isnan (measureT[k].Mflat) ? 0.0 : measureT[k].Mflat;
-      if (measure) {
+      // if measureT exists, we are in the relphot_image analysis loops
+      // if measureT does not exist, we are updating the measurements and
+      // need to use the 'measure' version
+      if (measureT) {
+	Mflat = isnan (measureT[k].Mflat) ? 0.0 : measureT[k].Mflat;
+      } else if (measure) {
         Mflat = isnan (measure[k].Mflat) ? 0.0 : measure[k].Mflat;
       }