Index: trunk/ppBackground/src/ppBackgroundLoop.c
===================================================================
--- trunk/ppBackground/src/ppBackgroundLoop.c	(revision 28281)
+++ trunk/ppBackground/src/ppBackgroundLoop.c	(revision 28293)
@@ -117,4 +117,7 @@
 
             pmChip *mosaic = pmFPAviewThisChip(view, patternMosaic); // Chip for mosaicked pattern
+            if (!mosaic->hdu && !mosaic->parent->hdu) {
+                pmFPAAddSourceFromView(patternMosaic, view, file->format);
+            }
             if (!pmChipMosaic(mosaic, chip, true, maskBad)) {
                 psError(psErrorCodeLast(), false, "Unable to mosaic pattern correction");