Gary Stofan
Ansys Employee
The legend uses OpenGL functionality and requires a graphic card/chipset that is intended for 3D engineering applications.
Are you using a laptop computer? If so, that may be the issue as most consumer laptops are not intended for 3D apps, and have limited OpenGL support.
We recommend using one designated as a "Mobile Workstation" with nVidia or ATI graphics.
You can easily find the graphics information by running "DxDiag.exe" then "Save All Information" DxDiag.txt
In the meantime, you might want to install Ansys on a desktop computer and see if the issue persists.