I can vouch for the existence of fixed NTSC cartridges, since I own one. I know the word of some random guy on the internet doesn't mean much, but it's true. THQ had a section on their site concerning the glitch (old news article about it here
) and, after I contacted them via that page, they exchanged my defective copy for a revised version. The product code ends in "USA-1," and it hasn't glitched on me once in the 10 years since.
To be honest, I'm surprised the 1.1 version hasn't been dumped (maybe it's rare?), unless it really is just a cartridge issue rather than a code issue.
Either way, I can technically say that somebody did at least figure out a fix for it.