DoubleGJ, the exe you sent me clearly got corrupted somehow, but I can't say if it was because of the Plusifier or something else. No one appears to be having the same problem with the Plusifier so it might be an issue with your system. It looks like you'll have to test older Plusifier versions like you said.

Edit: After doing some side-by-side file comparisons, it appears three sets of bytes have been changed to 0xEC 0x03, which is something the Plusifier is really unlikely to do even if corrupted. It's possible that an outside program has corrupted your JJ2 exe.