I recently made a fork of MLLE specifically to fix damaged .j2l files (among other issues). MLLE was using an incorrect character encoding for the saved .j2l, so when a help string contained '§', it would corrupt the level. If you're having the same issue, this version of MLLE will automatically fix your corrupted level. If you don't want to overwrite your MLLE settings, you only need to copy MLLE.exe and MLLE.pdb from the zip file.