Windows 7 - Missing Date Popup

[ApolloX]

I installed a new 4k monitor, then ended up returning it. Somewhere along the way though, my Windows 7 was changed in such a way that I no longer get a calendar popup when I click on the date/time in the task bar such as shown in this sample screenshot:

Now, when I click on the clock in the bottom right, nothing happens. Is this a configuration issue or is my version of Windows 7 Pro hosed?

 

[GokAy]

What happens if you open Date and Time from Control Panel?

 

[ApolloX]

Nothing exciting, works as normal.

 

[GokAy]

Alright, my guess is that it is opening but at some odd location off-screen, possibly a bug of some sort.

Would you try:
- safe mode
- another user account (create one to check and delete later)

 

[ApolloX]

No luck. Ended up doing a clean reinstall of Windows because of other, similarly random issues.