When conducting an audio search I can't find Bootleg Mixes in the Genre dropdown. But when the tracks appear some are listed as Bootleg Mixes under Genre?????

I'm afraid that is the way it works. I never use genre searches, but I can see that in your case you may need to. Someone recently had a similar inquiry ... it might be worth posting some sort of constructive suggestion in the New Feature Requests. I can't see why there is a drop down menu for genres. Doesn't make sense to me.

The id3 tags on files are not generated by Limewire, but the people who choose to share the files. Hense the inconsistences.