AJAX edit stopped fully functioning... help me locate what's missing.

[SDB]

Hi

At some point, our AJAX post edit function stopped functioning fully.

Behavior as follows :

Click edit.. post turns into an edit box as expected.
make changes, click save... the spinning icon appears while the updates are made.
Then the spinning icon dissapears, but the post remains as an edit box, and doesn't revert to the normal text of a post.

To be clear.. the edit actually happens.. but the edit box does not dissapear and get replaced by the final text.

Any pointers as to what has gone missing to save me a) posting up our code, or b) reverting templates, would be really helpful.

Cheers

Simon