Excuse my vagueness but I have run into an issue on a couple of occasions where a complex VDMX project with lots of layers and multiple screen output has glitched out when ejecting a QC comp or loading a new one.
Its only happened when i have been under pressure to make a show and I have manged to avoid the issue by simplifying the setup or rendering comps to video, but did not have time to get my head round exactly what was causing it. I had a suspicion it was linked to comps with iterators.
Once i recall it was happening when i had many QC comps in many layers that i was enabling and disabling inside qc (not ejecting).
I outcome is glitching flashing on the main output - similar to when you forget a clear in QC.
I have just spent a while trying to recreate the issue in the latest version and failed, so maybe its fixed.
Sorry i didn't have time to submit a proper bug report at the time - but i thought if worth mentioning now in case its a know issue or anyone else has experienced it and can shed light on how to avoid it.
cheers_ bAjA