Forum and Browser Compatibility

Does anybody know which forum software has the least (or no) problems with any type of browser?  My problem is that one of the forums I maintain acts differently on different browsers.  The WYSIWYG editor won't allow people to type in the messagebox if they are using Firefox, and some of my users aren't very internet-literate that they are not aware of spyware/adware messing witht heir Internet Explorer and they blame it on the forum.  Does anyone have any ideas as to what to do (I use vBulletin) or what forum software does not have these problems?  To those who sue vBulletin - do you have these problems as well?

This is not a problem of the forum itself, but the template that you use.

Try to use another template, or hack your own

Wait, that sounds wrong...

You meant "use", right?

speaking of sueing vbulletin, they have crappy boards definately a thumbsdown

ur
Sorry to drag up an old thread, but that is an absurd commment. Now, it may not be the best BBS in your view, but I fail to see how you can call it crap. Its got a brilliant hooks system, a feature-rich ACP, and massive modding community which outputs incredible add-ons to an already solid piece of software.