I am chasing a problem that may be a root to this one. IE 6 goes busy when I
click on a link or the BACK button. Now nothing in the main message queue
works:
CTL-ALT-DEL starts taskmgr.exe but no window displays
No active Application window repaints on exposure
Task bar and START not responsive
Yet MSOFFICE taskbar pops in and out (but no visible launch)
Some applications react (repaint window) on mouse hover but cannot be dragged
WINDOW-L sequence activates fast user switch and I can logon as someone else
ALT-TAB shows active appications and a moveable hightlight but no change in
display outside the ALT-TAB window. (I think there is a Message Box being
displayed UNDER the IE window that never gets to update real display and is
waiting for input it never gets--I see a generic window icon in the ALT-TAB
list, that
is similar to what I see occasionally when a Message/Warning dialog is
displayed)
I have tried killing IE via the alternate administrator user. Now the
desktop is BLACK
where IE window was located and frequently I cannot get WINDOW-L to fast
switch.
I tried killing the explorer.exe in the hung user, fast user switch back and
clean desktop WITHOUT TASK BAR AND START BUTTON. Now I can move window
previously under IE but cannot open new window, start tasks, or anything
useful.
Before I noticed WINDOW-L usually works, I had to use power-off button which
starts a shutdown with many "not responding" dialog displays needing Kill Now
Frequently, the shutdown progressed to the welcome screen (Saving your ...
and Shutting down) after killing the explorer.exe running the desktop. The
automatic reset sometimes would not happen. Then I hold in power button for
4sec to force power off. Reboot shows no improper shutdown activity.
I suspect the "messages" dispatcher is hung in some "helper" or
"application" so as to block entire desktop from updating (or is it a
priority problem with a dead-locked hi-priority task that is lower than mouse
tracking and a few dialog display functions?)