If you mean the display in Task Manager is no longer showing a multi tab display and all you see is the contents of the Process tab (the second tab), you may be running TM in "tiny footprint" mode.
Try double clicking the left or right gray border area of the TM window to see if the tabs and top menu bar appear. You can toggle back and forth the footprint modes this way.
In Tiny Footprint mode there is also no X button to close TM and it should come back up in regular mode the next time you start it. I don't think tiny footprint mode should be sticking, but there may be a way to force that. Is that how yout TM opens every time?
See what that does for you and report back.
I did find a way to make it stick in tiny footprint mode. If you are in tiny footprint mode, and press ALT+F4 to close TM (I was just killing the taskman.exe since there was no X button), the next time you start TM, it comes back up in tiny footprint mode.
Edited by joseibarra, 27 June 2009 - 07:20 AM.