some easy steps to reproduce the problem:

:set t_Co?
t_Co=256
:set background?
background=light
:set background=dark
:set background?
background=dark
:hi Normal ctermfg=grey ctermbg=234
:set background?
background=light
:hi Normal ctermfg=grey ctermbg=0
:set background?
background=dark

as you can see, the "hi" command changes background to light when ctermbg is 
set to 234, however, according to 
http://upload.wikimedia.org/wikipedia/commons/9/95/Xterm_color_chart.png color 
234 is indeed a dark grey

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