g:colors_name unlet when changing 'bg'

[graywh]

This causes weird things to happen. Perhaps this is something weird in syntax/syncolor.vim. I dunno.

[cstrahan]

Any update on this? I'm experiencing the exact same thing. It's sort of frustrating, because the ToggleBG function in the solarized theme checks g:colors_name to determine if it should reload itself - if not, it just toggles vim's background.