I have been reading recently complaints that the buttons and graphics have been disappearing from the VRE - Visual Rich Editor - in WordPress. There are appears to be a common string amongst the users - that they use Firefox!
Yesterday I installed a plug-in for Firefox that disables scripting by option on a page - it's a security plug-in that is quite popular. The plug-in is NoScript 126.96.36.199 or earlier - that a user can control and stop scripts from executing on a web page. I used it and found it to be too much hassle having to permission each page and I turned it off.
I went to write a post and noticed that all my icons and editing tools had disappeared from the VRE. This happened on a couple of my blogs. I started a process of elimination and then realised the culprit was the No-Script Firefox Plug-In. I had to remove it entirely, once I did this - the icons reappeared and is now working again.
I suggest users with this problem check their settings to ensure the following:
Visual Rich Editor is checked
Check recent extensions to make sure none disable scripting or can be reconfigured
This should work – if not – I’m out of ideas.