The '#' distinguishes the column as a custom column as opposed to a factory installed (e.g. title) column - you can't edit or delete factory installed columns.
It may mean other things too, but I think that's the 'gist' of it.
I can't help you with your main issue - genre works for me (to the extent that I use it - which isn't much), I think I created it when I was running 0.8.nn.
BR
I'd use the genre more if I could preload it, maybe from a standard reference source.
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