As part of the move to the new site I also upgraded wordpress to the latest release (3.3.1). Unfortunately I found a small bug in that version so I have reverted to the earlier version.
The bug is odd, and not particularly problematic but irritating nonetheless. It prevents upload of media (such as is used in embedding images) and also loses the html editor toolbar – the “visual” toolbar remains unaffected. Oddly though, the bug only manifests itself in the edit of “pages” as opposed to “posts”.
I think I’ll wait until the next full point release (to 3.4) before trying again.