Can't Switch Programs On Screen Via Programs Pinned to Taskbar

An example:

I open Firefox full-screen.

If I try to switch to Outlook, which is open and showing in the taskbar, it wont let me.

I am forced to minimize Firefox

Same thing happens when Outlook is full screen.

Windows 7 Home Premium 64 bit

Any suggestions?

Thanks

Please elaborate on "it won't let me." What happens exactly? Does the button react at all when you click on it?

When I point the cursor at the pinned program icon in the taskbar, it shows the various windows that are open within Outlook. If I point my cursor at one, I can even see the window. But if i try to click on a specific window, I return to Firefox.

The same thing occurs if I minimize Firefox, open Outlook and then try to open Firefox

The taskbar, btw, is set to combine the various windows under one pinned icon

Weird. I have no idea unfortunately.

I solved my problem by going back a couple of restore points.