This is sounding like classic JavaScript conflict area. Either that or a corrupt install bit I much prefer the former.
Do you know how to utilise the web console to look for script errors? If not this wordpress codex article explains how althop8gh the Firefox example is a little out of date: http://codex.wordpress.org/Using_Your_Browser_to_Diagnose_JavaScript_Errors
It would be useful to limit this to show just errors so that we see quickly of anything is being reported. I would try Mentions and the admin panels first…
If you prefer to us to look then we would, of course, need a set of login credentials and the account would require being created as a Simple:Press Admin. If you DO prefer this then:
- please PM credentials to both myself and to ‘Mr Papa’.
- Please include in the PM a link to your site.
- Include a link to this thread and a…
- brief reminder of the problem.
And one of us will take a look for you.