diff --git a/VERSION b/VERSION
index a3977136..858efdc7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.643
+8.3.644
diff --git a/drc/DRCbasic.c b/drc/DRCbasic.c
index 8c97c866..91a97459 100644
--- a/drc/DRCbasic.c
+++ b/drc/DRCbasic.c
@@ -830,7 +830,7 @@ drcTile (tile, dinfo, arg)
 		     * an exception area.  Exception rules are ignored if
 		     * the edge is outside an exception area.
 		     */
-		    if (!isinside && (!(cptr->drcc_exception & DRC_EXCEPTION_MASK) == 0))
+		    if (!isinside && ((cptr->drcc_exception & DRC_EXCEPTION_MASK) == 0))
 			continue;
 		    if (isinside && ((cptr->drcc_exception & DRC_EXCEPTION_MASK) != 0))
 			continue;
diff --git a/resis/ResMerge.c b/resis/ResMerge.c
index 667fcaad..4a65c507 100644
--- a/resis/ResMerge.c
+++ b/resis/ResMerge.c
@@ -413,6 +413,17 @@ ResParallelCheck(resptr)
     int		status = UNTOUCHED;
     resElement	*rcell1, *rcell2;
 
+#if 0
+    /* XXX WIP XXX Diagnostic! */
+    /* This double loop needs to be replaced with something more efficient,
+     * or else long arrays of contact cuts can take an unexpectedly long time
+     * to process.
+     */
+    int rcount = 0;
+    for (rcell1 = resptr->rn_re; rcell1->re_nextEl != NULL; rcell1 = rcell1->re_nextEl)
+	rcount++;
+    TxPrintf("ResParallelCheck():  Resistor list length = %d\n", rcount);
+#endif
 
     for (rcell1 = resptr->rn_re; rcell1->re_nextEl != NULL;
 		    rcell1 = rcell1->re_nextEl)