First of all, if you have any Haxies, InputManagers, SIMBL plugins or similar operating system hacks installed, please remove them first, restart the program, and make sure the bug is reproducible without them.

If you are reporting a file that does not extract properly, please attach the file in question, or provide a link to it, so the problem can be reproduced. If you do not, the problem can not be fixed.

Also make sure you have tested the latest version of the program. (Use the Downloads tab above to find it.) cannot check Bzip2 file

Apple has unfortunately removed this feature from all App Store apps. You will have to get the non-sandboxed legacy version outside the App Store to get it back.