Nah, it was not a known issue. We discovered it when someone told us that the game didn't work on copiers and "accurate" emulators. I just code and never think that it would matter THAT much that it work on a copier or accurate emulator. Oh well... I guess some people are funny that way that they won't play the game unless it plays on an accurate emulator.
See, the way you've got to think about it is, what happens when ZSNES gets updated and now no
emulator plays it right? Naturally this is based on the very hypothetical scenario that ZSNES will ever have another release, of course.
If you code a translation and intend it to be used on the actual hardware, you know
it works. At that point, the fact that the game won't work on certain emulators becomes their
problem, and not yours. :)
On a related note, when are you planning on fixing Gulliver Boy? ;)