Windows Not Maximizing to Full Width

IComeInTheWest@gmail.com

Hello,

Currently, windows on my primary monitor (I have dual display) will
maximize to only about 1/2 the proper width. The taskbar and desktop
still extend the full width of my monitor and when I restore down, I
can manually extend the window to the full width. This problem has
occurred sporadically in the the past; I'm not sure if it has always
been the primary display. This time, it happened when when unlocked my
Windows XP account.

When I set my current secondary monitor as primary, the problem
follows the primary assignment. The problem does not exists on the
secondary monitor.

I can fix the problem by rebooting, but would like to know the cause
and a better solution. Please advise.

Thanks,

Calvin