I've come across a strange issue I can't quite figure out.
I have cPanel server running LiteSpeed and PHP 5.3.6 (w/ APC).
When I try to upload an image via WordPress I get a red "HTTP error" like this:
When I switch LiteSpeed to Apache the upload works just fine.
I thought it was related to APC, but with APC disabled/enabled in either Apache/LiteSpeed the results are always the same... the upload doesn't work properly in LiteSpeed.