XF 1.1 Empty post edit box in Firefox


Active member
When trying to edit a post in Firefox, the popup edit box comes up blank. It is not possible to type in the box, as the cursor does not show up in it.

When editing the message in a separate window, there are no issues.
No issues in Opera or IE.

This is not a server problem, since it appears on two separate forums hosted with different companies.

Does anyone know a fix for this?