This started a couple of weeks ago when I dragged an object across the screen.  I tried everything I could at the time, but was involved in a project that I couldn't take time off from.  Today, I upgraded to 2.5 but the problem persists.  In order to use Start11 I need to set the taskbar to autohide.  Otherwise it gets in the way of whatever app is maximized.  I tried moving the taskbar to the top and it displayed in the correct position.  It even worked properly when moved to the left or right sides of the screen.  But on the bottom, it displays a couple of inches off the bottom.

I hope someone knows how to fix this.  Thanks in advance,