problem solved. it was a cache problem with W3 Total Cache. I deactivated the plugin without success. Then I deleted the plugin. Didn’t help either. Turns out the plugin leaves a trail in .htaccess. I manually edited the file and removed the cache references.
issue update: the problem seems to be happening only on the home page now.
why would that site be restored, but not the others. sounds unlikely, but thanks anyway.
Maybe it’s too late, but if you still need it you can check out the results for a TwentyElevenChild theme search on http://wpbyexample.com. It’s a WordPress theme search. Maybe it can come in handy later.
