I've run into a mess with my site today http://www.bowalndwalks.co.uk. It all started by me trying to upload larger images to my site (I was getting a HTTP error).
My webhost recommended I change my file permissions, and I think did it correctly as they suggested.
However, I noticed gallery thumbnails were not displaying so I re-set the permissions as best as I could. Now the thumbnails are displaying but the images don't go to a floating box they go a separate attachment page.
Also, my WordPress login bar has disappeared at the top of the page and dropped to the bottom. It all looks a bit of mess to be honest.
Also, I now can't seem to upload any image now, I am getting an HTTP error for every image.
Sorry if I am not explaining myself very well. Hopefully there is something easy I am missing. Thanks for any pointers.