diff -up Argyll_V1.0.4/spectro/dispwin.c.jx Argyll_V1.0.4/spectro/dispwin.c
--- Argyll_V1.0.4/spectro/dispwin.c.jx 2009-06-23 02:27:04.000000000 -0400
+++ Argyll_V1.0.4/spectro/dispwin.c 2009-11-09 16:35:42.000000000 -0500
@@ -545,7 +545,8 @@ disppath **get_displays() {
return NULL;
}
- if (outi->connection == RR_Disconnected) {
+ if (outi->connection == RR_Disconnected ||
+ outi->crtc == None) {
continue;
}