I already posted this in the 'themes'-forum, but I think it is more appropriate to post here...
I last installed a new theme around february of this year.
Recently I upgraded my blog to 2.7, and installed a local 'try-out' version on my own machine, and started adapting another theme (so on the local server).
Today I wanted to install it on my 'official' blog, but it turned out it was impossible to change my theme.
When I click on the new theme, I shortly see the dark-gray background, and then the preveiw of the new theme shows up, but without the black border where you find 'activate -new theme-'.
I already tried reinstalling 2.7 (maybe there was some file missing?), but this didn't solve the problem.
So it seems I'm stuck with my 'old' layout.
Anybody who has a suggestion?