Yeah, removing the tabs isn't enough to fix this problem. I know EXACTLY what you're going through. I have a Terranigma PAL version and it will not play, either. I've heard of lots of different methods to get them to work. One might be to buy a Pro Action Replay or a Tri Star/Super 8 converter. I've heard you can get certain games to work that way.
Another method you might try is to get a NTSC to PAL converter for SNES. I look all the time for one on ebay. When they do show up, they go for lots of money..usually over $75.
Another thing you can try is to have the system modded to play PAL games. I think Ravengames might perform this service for around $70. <a href="http://www.ravengames.co.uk." target="_blank">www.ravengames.co.uk.</a>
Jon