Foren / Cotonti / Support / major php crash???

earlier you said that you had only 60 posts in the forum.How many posts did you have on one topic?
i'm asking this cause in the past i saw a similar problem when a topic had 11 posts and in the settings it was allowed only 10 per page.

Speaking on media libraries and ect.I think you should run your site on a localhost,install a clean copy of cotonti and test all of your plugins on the default skin.If you find some errors - try to turnoff each plugin one by one till you find the cause of the problems