black screen

[apeturis]

Hi I recently downloaded the ppsspp emulator and I was configuring it for graphics and I kept seeing that the non buffering render was the best but when I select that it causes a black screen to come over the emulator while the game still runs. I noticed this in Final Fantasy tactics and it seems that is the only one it does every time. I have the v0.9.7 ppsspp and I was wondering too if that is good or if the patched ones are better. The sound also messes up when a lot happens at once in the game and I am guessing it is because I can't use the non buffering render so please help and see how I can fix this black screen!!!