I hope the answer isn't glaringly obvious. I've browsed the forums, haven't seen anything.
I'm running Vista 64-bit. This problems does not change if XP compatibility mode is selected.
A lot of my songs have the genres showing up correctly in Windows Explorer, but in Mp3tag v2.39m (and the non-dev version), the genres for a lot of songs are not showing up correctly. In Winamp genre is Rock, in Mp3tag genre is 17. It doesn't correspond to tag #.
If wanted I will upload a file that is having problems.
They are all MP3 files identified as using ID3v2.4.
To reiterate: Windows Explorer and Winamp shows MP3s as having proper tags, Mp3tag does not.
If more information is needed, please let me know, I don't know what else to provide.
EDIT: Discovered the cause!
I hate how I despair at finding a solution so I post and as soon as I post, I discover the solution... ah well... perhaps somebody else will find this of use.
Mods, feel free to change topic to solved or whatever.