Hello,
I am using Firefox 3.5.5 and i haven't come accross this problem. Could you please answer the following questions?
1) Is this issue also visible on the live site? If yes, could you please send me the link?
2) If no, could you please try to debug the generatet code with e.g.
firebug or send us an e-mail to support@kentico.com with access credentials, so we can take a look at the issue by ourselves?
3) One more question, have you modified in any way the standard editable text/image web part?
Best regards,
Boris Pocatko