I've seen a few topics on this but none that are mac specific. I understand some people have had success by changing the filename of "cache.properties.lock".
Briefly, my problem:
The program works perfectly, right up until I come to export a mod. When I click export, the program simply closes, generating no report (or mod). I took a screen recording (gif below) incase there's any confusion.
Any help would be appreciated - even a location of the "cache.properties.lock" file on a Mac would be handy (if it exists).