Task bar notification icon doesn't work

If I use the two-finger swipe on my Magic Trackpad, I can show the Notification Center in Mountain Lion. However, if I click the little icon in the task bar (far upper right corner), nothing happens. By "nothing happens", I mean the icon inverses color when I click on it, but the Notification Center sidebar does not appear. There is no error or any other indication of why it would not show. Is this normal behavior?

The problem did not occur in the guest account. So this indicated a problem unique to my user account.
I next used Cocktail to check a setting. It has a System > Misc > Disable Notification Center option; however, it was not checked (i.e., it was the default). But I tried disabling Notification Center and re-enabling it, and this caused Notification Center to start working. (The old "turn off and on" trick.) However, after rebooting, Notification Center was back to not working again. Obviously not a solution.
So then I tried removing all the login items. This actually worked. I had quite a few, so there's no telling which might have been the culprit. The next step will be to re-add the ones I need, one at a time, and keep an eye on Notification Center.
For future reference, these were the login items I removed:
FontExplorerXAutoload
Air Mouse Server
Caffeine
Default Folder X Helper
LaunchBar
Activity Monitor
TransmitMenu
Typinator
ShareToolAgent
MicrosoftMouseHelper
My Living Desktop Viewer
Google Drive
VMware Fusion Start Menu
ClustersHelper
AwakenHelper

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