I've stumbled on to a bug with Firefox 4.X and 5.0 that may affect you depending on your operating system and video drivers, possibly. Basically, if you look at a page with a lot of animated gifs (those smiley things), it will cause Firefox to use a lot of CPU, up to 100% which makes doing anything impossible.
Workaround: in the address bar type about:config and in the filter box, type in anim and look for image.animation_mode. Right-click on it, choose modify and change the value to either "once" to play the animation once or "none" to stop them completely.
Ok, I've got the custom character color drop-down added back into the post editor. It only works correctly when the editor is in code view. If you toggle the editor into WYSIWIG view (blue arrow in brackets at end of 2nd row) it will show the text in the correct color. When you flip back to code view, it will have replaced the character tag with the actual BBC tags.
Well, the board has been converted to 2.0 and it still works with all the posts and user intact!
Now, I'm in the process of making a Pelicar theme based off the new default 2.0 theme. The old Pelicar theme sort of works but it's all jacked up in a few areas LOL. I'm going to go ahead and take the board out of maintenance mode so you can look around.