problem with Editor

[myhfid]

hello

I have a problem Editor in my Forums

Does not exist in both Internet Explorer and Firefox

but h? Works in chrome and opera

my vbulletin version 4.1.12

http://img857.imageshack.us/img857/3908/image2rs.png
http://img194.imageshack.us/img194/9972/image1xc.png


thanks