I had two odd bugs pop up in AutoCAD while I was working today. First my entire drawing was empty - the model tab, all the layout tabs, all of them were blank. I saved my file (under a different name) and when I re-opened it, everything was back. The second thing to happen was that my cursor disappaeared. I could still interact with the drawing, but I couldn't see where I was on the screen. That also stayed until I closed and re-opened the drawing.
Neither of these really affected my work flow much, and this is the first time they've happened, so I'll just consider them a little graphical hiccup unless others have had this happen as well. I just wanted to put this out there as a heads-up in case it becomes an issue and needs addressing by Autodesk.
I've had the cursor stop from time to time and figure this is a Video card error.
As you said it is not chronic.
On board or dedicated Graphics card in your machine?
Regards, Charles Shade
CSHADEDESIGN | AUTOCAD LT | LT-KB | DYNAMIC BLOCKS
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Change the hardware acceleration setting in LT2013 and see if that helps (if it's one, turn it off, if it is off, turn it on): 3DCONFIG command.
If you are using Win7, turn off AERO Theme and use the Windows Basic Theme instead.