Index: branches/eam_branches/ipp-20211108/psModules/src/imcombine/pmStack.c
===================================================================
--- branches/eam_branches/ipp-20211108/psModules/src/imcombine/pmStack.c	(revision 41920)
+++ branches/eam_branches/ipp-20211108/psModules/src/imcombine/pmStack.c	(revision 41921)
@@ -1650,6 +1650,6 @@
 		combined->mask->data.PS_TYPE_IMAGE_MASK_DATA[y][x] = blankMaskBits; // probably not needed since it was set above.
 		if (expmaps) {
-		    expmaps->image->data.F32[y][x] = NAN; // XXX should this value be NAN or 0?
-		    expmaps->variance->data.F32[y][x] = NAN;
+		    expmaps->image->data.F32[y][x] = 0.0; // XXX should this value be NAN or 0?
+		    expmaps->variance->data.F32[y][x] = 0.0;
 		    expmaps->mask->data.PS_TYPE_IMAGE_MASK_DATA[y][x] = 0;
 		}