You are running an Autodesk 2012 product on a system whose screen resolution is scaled to 150% and you are seeing abnormalities in the standard buttons and ribbon controls including:
- A detached and floating red A (upper left corner)
- The X button to close AutoCAD (upper right corner) does not work
- Many ribbon controls do not perform as expected
Autodesk 2012 products may exhibit these issues on systems where the screen scaling is set to 150%. You can work around this by setting the screen resolution of your system to 96 DPI (or 100%).
An alternative method is to right-click on the AutoCAD icon, select the Properties settings, and select the option to "Disable display scaling on high DPI settings."
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