I'm running emacs 24 and trying to change the colour theme but it's not working.
When I start emacs it displays in the default colours. I do
M-x load-theme RET tango RET and the colours revert to white on a black background (other themes do the same thing).
I'm running emacs on debian wheezy through a putty window on a Windows 7 host. I've tried a local instance on debian with no change. I've tried both a pre-built package and building directly from a git mirror.
I'm something of an emacs newbie so it's possible I'm doing something stupid. Any help would be much appreciated.