i just testing open vbulletin suite for any incompability with any browser, so this is what i found (the testing is just only in a few step but not too deep review).

1. Chrome ver 5.0.375.99 - looks ok so far no problem.

2. IE ver 8.0.7600.16385 - looks not good when making article, the IE will put unnecessary tag along with my articles.

3. Opera versi 10.60 - looks mess when trying to open and create articles (the editor toolbar will show on the top navigation on vertical appreance.

4. Safari 4.0 (530.17) looks fine (i did not try this test a lot for Safari since never use it).

Hope it useful to fix the issue with the next version.