[Brian]

We haven't been getting large numbers of folks reporting a problem since upgrading. The support ninjas will be happy to work with you to get this up and running, but I don't think this is an issue that most customers are having. That means the odds that someone else will be able to post a solution that works for you are pretty low.

Since it doesn't appear to be a general problem, it might be worthwhile to see if the Genius Bar at your local apple store has any ideas after taking a look at the Mac directly.

Edited the thread title slightly to so folks searching the forum wouldn't get the wrong impression.