Hi @Anonymous,
I see that you are visiting as a new member to the AutoCAD forum. Welcome to the Autodesk Community!
It would be helpful to know if the AutoCAD installation has been fully patched and updated per Imad's suggestion.
It would also be helpful to understand the complexity and size of the drawing where this is occurring. Is it happening only in one unique file or all files?
Can you attach some sample files so I can see if I can duplicate on my computer too?
Perhaps this is a graphics card issue. Is the driver current?
Please select the Accept as Solution button if my post solves your issue or answers your question.
John Vellek
Join the Autodesk Customer Council - Interact with developers, provide feedback on current and future software releases, and beta test the latest software!
Autodesk Knowledge Network | Autodesk Account | Product Feedback