Index: trunk/ppSub/src/ppSubReadout.c
===================================================================
--- trunk/ppSub/src/ppSubReadout.c	(revision 14593)
+++ trunk/ppSub/src/ppSubReadout.c	(revision 14650)
@@ -29,4 +29,5 @@
 
     // Look up appropriate values
+    bool mdok;                          // Status of MD lookup
     int size = psMetadataLookupS32(NULL, config->arguments, "KERNEL.SIZE"); // Kernel half-size
     int order = psMetadataLookupS32(NULL, config->arguments, "SPATIAL.ORDER"); // Spatial polynomial order
@@ -49,5 +50,5 @@
     psMaskType maskBlank = pmConfigMask(psMetadataLookupStr(NULL, config->arguments, "MASK.BLANK"),
                                         config); // Mask for blank reg.
-    const char *stampsName = psMetadataLookupStr(NULL, config->arguments, "STAMPS"); // Filename for stamps
+    const char *stampsName = psMetadataLookupStr(&mdok, config->arguments, "STAMPS"); // Filename for stamps
 
     // Generate masks if they don't exist