Index: trunk/pstamp/scripts/pstampparse.pl
===================================================================
--- trunk/pstamp/scripts/pstampparse.pl	(revision 27217)
+++ trunk/pstamp/scripts/pstampparse.pl	(revision 27238)
@@ -210,4 +210,6 @@
     my $y       = $row->{CENTER_Y};
 
+    # XXX things don't work if bit zero of option mask is not set;
+    $row->{OPTION_MASK} |= 1;
     my $option_mask= $row->{OPTION_MASK};
     my $inverse = ($option_mask & $PSTAMP_SELECT_INVERSE) ? 1 : 0;