I think itis just as important to not which browsers had NO difficulties.
These test posts were perfect. Big pat on the back
You can also see it in action at efanguide.
http://www.efgforum.com/cgi-bin/ultimatebb.cgi This is a huge forum that was starting to outgrow the server. Reports are that this has given it some new life.
It does show the need to make addtions to the code for people that have "categories only" showing on the front page, and perhaps also change the link to the php extension in the nav bar, but for startes this is terrific. When it is complete it will be awesome!