Everytime I use NSMBe, it opens with the "Open ROM" bit, but once I select the ROM, nothing happens. It closes but apparently its still up with the NSMB Game Selection Icon. But whenever I click on it from the taskbar, nothing comes up.

Help?

Any errors pop up? What Windows version are you using?
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hey look, I did a thing

No errors, Windows 7.

EDIT: OK, I found a fix for the problem:

Simply making a new folder and re-extracting the ZIP into that seems to have worked. However, I tried replacing the old folder with the contents of the new folder and it hasn't changed. It might just be some kind of "aging" thing or something.

This happens constantly for me. It's so strange - suddenly, NSMBe just crashes, and when I reload it it doesn't work. And the way to fix it? Literally make a new folder, cut and paste the SAME 'crashed' FILES into it and voila.
Don't know why this happens, but yes, the files do seem to 'age' until they're copied into a new folder. No idea why.