not sure if this is the best place to ask this question, but since i have alot of zsnexbox users in one area it's worth a shot

i'm using version 2.2 of the emu and for some reason, when i'm playing button intsenive games (like super street fighter 2 for example) occasionally the emulator seems to mis-interpret the buttons i'm pushing. i'll be fighting, then try and do a move and all of a sudden it'll pause, like i've pressed the start button. even tho the start button is nowhere near my thumbs...
also i've noticed it will occasionally pop up with "unable to load savestate 0" or some such text. which i guess would be from some kind of key combo situation aswell. but i checked the pad configuration and there are no turbo keys set and no buttons set for loading or saving save states. i'm using the default config.
it doesn't happen in normal games, just ones where i'm doing alot of button pressing, mainly simultaenously.
my question is, is this a known bug? are other people getting it? is there a way to fix etc?
and hats off to nes6502 for this cracking emulator.