wow.. I'll check it out.. that is weird.
Ive seen this happen for a while but kind of always thought it was something weird i couldnt track down in my skin.
When ever i use the MUTE command, RR will briefly show the previous screen i was on.
I just tested this on my virgin RR install dir using BMV2 and the same thing happens there.
I also have screen transitions on and set to -1 (fade)
I also notice that if i execute a "reloadskin" command, it fixes the problem until the next time RR is fully reloaded.
i can provide a video of this in action if needed.