[Quicksilver]

Has anyone tried creating a new subscription or wiping out all the old and creating new?

The thing I love about any graphical interface is that there are raw settings under that visual shell that have to be interpreted to be displayed by the interface. If those settings are corrupted they may display but not be functional.
In other words: Don't always believe the pretty picture on the screen!
(I miss the bulletproof reliability of txt based interfaces...)

It is still more likely that Wayne's server upgrade broke the notification module. It could be looking for changes in a hardcoded location or have disrupted the communication method. Once he is aware he can get it fixed.