Paste error - 'Temporary DWG file doesn't exist'

I keep getting this paste error today.  It's very frustrating because I copy/paste alot in order to save time and not have to redraw everything.  I am unable to paste ANYTHING - either within one dwg or even between dwgs.  The error occurs whether I use the menus, keyboard shortcuts or right-click menu.

Edit:  After restarting DS, I am able to copy/paste within a dwg.  However, when attempting to paste between dwgs, I am still getting an error.  I click paste and the item appears, but when I click a location, the command window simply says <>

 Edit: System Details: Windows XP Pro 5.1.2600, 2.2GHz processor, 4GB RAM, Dell Precision T3500