Index: /trunk/ppMerge/src/ppMergeReadChunk.c
===================================================================
--- /trunk/ppMerge/src/ppMergeReadChunk.c	(revision 19013)
+++ /trunk/ppMerge/src/ppMergeReadChunk.c	(revision 19014)
@@ -17,5 +17,7 @@
         for (int j = 0; j < fileGroups->n; j++) {
             ppMergeFileGroup *fileGroup = fileGroups->data[j];
-            if (fileGroup->read) continue;
+            if (fileGroup->read) {
+                continue;
+            }
 
             // find max last scan so far
@@ -40,4 +42,5 @@
                 inRO->thisWeightScan = fileGroup->firstScan;
                 inRO->thisMaskScan   = fileGroup->firstScan;
+                inRO->forceScan      = true;
 
                 // Read a chunk from a file