Hi Kevin,
You may want to try install/re-install Visual Studio 2008 SP1 to get this problem solved.
There were similar cases that got resolved by re-installing VS 2008 SP1, like this one for your reference:
http://social.msdn.microsoft.com/Forums/en-US/tfsworkitemtracking/thread/86a8bd59-e45a-4463-b868-0bf76ad706e3Please let me know if that works for you.
Thanks,
Jie
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