This has been mentioned in a few places, but I don't think it has its own thread, so I don't know if it's getting any attention.
When "stacking" buffs, the little icons that appear to show you which buffs you have active will often collapse onto one another so keeping track of which ones you really have active, and which ones have expired, and how much time you have remaining on each buff becomes totally impossible.
I -think- it happens during the transition between levels/zones? If that means anything?