Windows 7 Slow Logoff for active directory users

We have many users on Windows 7 who can log off in a minute or so, but recently several users have reported it's taking them 5-10 minutes or more to log off.  We haven't made any changes to group policy, no shut down scripts are running, There were some recent windows updates, but no other policy or system changes recently.  I've disabled the "shutdown: clear virtual memory file" option in Group Policy, I've tried disabling the FW and other services, all to no avail.  If it log on with a local user and log off, there is no slowdown, but if I log on with an AD user, it always takes at least 5 minutes to log off.  

In the event viewer I see this as a possible clue:
Event viewer
 
4626  -  The COM+ Event System timed out attempting to fire the Logoff method on event class {D5978630-5B9F-11D1-8DD2-00AA004ABD5E} for publisher and subscriber . The subscriber failed to respond within 180 seconds. The display name of the subscription is "wltrynt SENS Logon Spy Subscription". The HRESULT was 800705b4.
 
6006 - This comes up both before and after the 4626 error
The winlogon notification subscriber <Sens> took 193 second(s) to handle the notification event (Logoff).

There is a hotfix designed to address this problem.  I've installed it but there was no improvement.

Tried these:

In group policy, set Windows < Security < Sec Options < Shutdown: clear virt mem page file to "Disabled"

"gpedit.msc" and press 'Enter'. You would get Computer Configuration to Administrative Templates to System to Shut down Options. You can double click on "Turn off automatic termination of applications that block or cancel" and finish by checking 'Enable'.

double click on the 'WaitToKillServiceTimeOut' and change the value data to suite your immediate needs. After the changes, just click 'OK' to save your settings. [Side note: The default of this value data is usually 12000 milliseconds but this should be changed to between 2000 to 20000 milliseconds].