limit the use of savestates.
I'm also having the same problem, but I'm not quite sure what you mean here... I'm using ePSXe 1.7.0, have tried all of Pete's latest GPU plugins, but I always get a black screen after Kuja prepares to summon Bahamut to attack Alexandria.
Edit: Checked for the error that it was giving me. The error that it gives me is "Warning: ISORead overflow!"
Edit 2: Never mind, I worked around the problem by using pSX instead of ePSXe for that little snippet of the game. Everything works fine again.