Index: trunk/psphot/src/psphotStackMatchPSFsNext.c
===================================================================
--- trunk/psphot/src/psphotStackMatchPSFsNext.c	(revision 34136)
+++ trunk/psphot/src/psphotStackMatchPSFsNext.c	(revision 34317)
@@ -81,4 +81,7 @@
     psImageMaskType maskVal = psMetadataLookupImageMask(&status, recipe, "MASK.PSPHOT"); // Mask value for bad pixels
     psAssert (maskVal, "missing mask value?");
+    psImageMaskType maskSat = psMetadataLookupImageMask(&status, recipe, "MASK.SAT"); // Mask value for bad pixels
+    psAssert (maskSat, "missing mask value?");
+
 
     float minGauss = psMetadataLookupF32(NULL, recipe, "PEAKS_MIN_GAUSS"); // Minimum valid fraction of kernel
@@ -123,4 +126,27 @@
     psImageSmoothMask_Threaded(readout->variance, readout->variance, readout->mask, maskVal, SIGMA_SMTH * M_SQRT1_2, NSIGMA_SMTH, minGauss);
     psLogMsg("psphot", PS_LOG_MINUTIA, "smooth variance: %f sec\n", psTimerMark("psphot.smooth"));
+
+    // Insure that invalid pixels are masked
+    // XXX: the smoothing seems to generate nan pixels in the variance image
+    // XXX: We may need to loop over the cached sources and redefine the maskObj images...
+    pmReadoutMaskInvalid(readout, maskVal, maskSat);
+    {
+        // Now go rebuild the sources' copies of the mask
+        pmDetections *detections = psMetadataLookupPtr (&status, readout->analysis, "PSPHOT.DETECTIONS");
+        psAssert (detections, "missing detections?");
+
+        psArray *sources = detections->allSources;
+
+        if (sources && sources->n) {
+            for (int i = 0 ; i < sources->n; i++) {
+                // XXX: move this to a function in pmSource.c
+                pmSource *source = sources->data[i];
+                if (source->maskObj && source->maskView) {
+                    psFree(source->maskObj);
+                    source->maskObj = psImageCopy (source->maskObj, source->maskView, PS_TYPE_IMAGE_MASK);
+                }
+            }
+        }
+    }
 
     psLogMsg("psphot", PS_LOG_INFO, "smoothed");