Notification center "grayed out" and will not open. Any ideas on how to fix?

I purchased Mountain Lion this morning and updated from Lion. Everything worked smoothly. As I was looking through various new features, I see that Notification Center is "grayed out" and won't let me open it.
When I go to System Settings, Notifications is there, and will let me go in and make changes. There's no indications that it shouldn't work.
Mid-2007 iMac, 4GB RAM, 2.8ghz Extreme.
Any ideas?
Thanks!

Little late to the party on this, but I was having the same issue. My notification center icon was greyed out and nothing happened when I clicked on it.
Here is the fix that worked for me.
Found the following folder:
~/Library/Application Support/NotificationCenter
Inside it were two files. Presumably there should only be one.
The first was
XXXXXX.db
Where "X" was a series of numbers.
The second was
XXXXXX.corrupt
I deleted the file with the corrupt extension and emptied the trash. Then went to activity monitor and force quite the Notification Center process. This caused it to restart and everything was back to normal.
Hope that helps.

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