Jacob,
We had a little mixup where Thomas Aylott decided that we needed a space between : and ; so he put in a snippet to insert ": ;", and took out the smart typing pair. The correct way to get a space in there would be to make a macro which first types colon, then types space, resulting in the desired ": ;", but leaving the smart typing pair behavior. Personally, I prefer not having the space there at all. Anyway, it's been sorted out now (i.e. reverted to the previous behavior) in the svn repository, so you can check the css bundle out from there to fix it, or wait for the next update.
Thanks for the explanation. I'm not sure how to "check it out" from the svn repository. How do I go about that? (I'm a lightweight TM user)
Josh