Here is your answer..................
Go to this thread
http://forum.ppcgeeks.com/showthread.php?t=64345
In Post #7 there is a cab file disableworldclock.cab
Download to phone and run....
Now when you click the clock it will bring you to call history and surprisingly this corrects your issue.
I had been dealing with that issue for the longest time and this fix is a godsend.