Same problem here. Have posted on several other forums looking for solution. Here are some more details:
Clock/Weather widget no longer links to the Clock app when tapping the Clock in the widget.
Go to Setting > Applications > Manage Applications > All and scroll down to the "Clock" app. On my DINC2 w/GB, the Clock app is grayed out whereas the other apps are all listed in bright bold white. I checked the entire list and ONLY "Clock" and "CityID" are grayed out like this.
This is what my DINC2 reports for the Clock app:
version 1.00.000.081006.605
Storage 0.00B (for all three Total, Application, Data)
Cache 0.00B
Launch by default- no defaults set
Another user on another forum whose clock app still functions reports that his cache is also zero, but his storage is different for all three, total being 596KB (app 420KB, Data 176KB).
It looks like the clock app has disappeared or ben overwritten for some of us for some odd reason.