Ok I have been doing some stuff with my site today and installing other wordpress blogs on to the same domain (but different dbs) and last time I checked it my site was displaying fine, admin was ok etc. and so I left to do some studying.
I just went back and my blog main page has disappeared. I can access the admin folder, the entries are all there, but when I try and view the plugins and presentation section wp can't see any of the folders.
I'm thinking it's something to do with file permissions but have no idea why it would have changed so suddenly (and I've tried different permissions to see if that worked)
All ideas gratefully recieved I am really panicking here!
[edit: I'm concerned it may have something to do with an import i did of some old entries in mt format. when I originally imported them it caused my theme to switch to default]