AutoCAD 2013 :: CUI Unhandled Exception Has Occurred

I have been using AutoCAD 2013 for 2 days now, and already the new version seams so unstable! lots of errors every where!

 sometimes the file gets stuck, and while you draw the file looks empty, yet when you restart autocad, you see everything you didnt see drawn.

 yet this doesnt appear all the time, but the error I will be discussing does:

Try enter CUI and set the Quickcalculator pallet to appear on the right or left side of the screen. Close the CUI, and everything is going fine, and the pallet appears normal. Yet close Autocad and start it again, and an error will appear on start it says this:

"Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue. Width and Height must be non-negative."

and the Quickcalculator pallet will appear floating in the middle.

I tried everything, but no use. The same error over and over again. This didnt happen in older versions and no big changes happned to the CUI interface, which makes me conclude its a bug.