Blogtastrophe! My post are ‘not found’ despite being editable in the admin

Yesterday I installed a couple of plugins into my WP2.7 blog Creativity Base, and after the most recent one (Revver’s plugin for managing Revver video content) my blog has been crippled.

All of my old posts are now replaced by the ‘not found’ message, even my ‘about’ page. I’ve since tried to make a new post, but the same thing happens with that.

I’m confident that there’s a link/code error to blame for this somewhere, as if i edit comments, then click on the corresponding article, i can actually still edit the original posts.

Republishing posts does not help. Reinstalling WP2.7 does (did) not help either.

I’m running out of options now, and have scarce knowledge of PHP… but I’m happy to provide admin access to a guru/developer who might like to poke around in there for me. I’m a filmmaker, and I’ll happily send a thankyou gift of two of my DVDs to whoever bails me out of this, and write them up favourably in the blog itself once it’s restored. Thanks in advance!