Okay, that's odd then you are running into those issues, etc. I've played numerous titles, USA versions, with no issues whatsoever. Only other thing that I can think of is that there is some setting you set or saved that is causing these issues. If NOT, again, try the USA versions of the ROM images is all that I can suggest further.
IF IF IF there are still issues with the USA ROM images, then I have no clue as to why the ROM images are behaving oddly, etc.
Besides, I'm sure the PAL versions are exactly the same as the USA versions, etc. No BIOS is needed for snes games, I know that much. It could be there are compatibility issues with PAL and/or JAP ROM images... who knows...
Hope this helps.