Symptom: Some of the newer nVidia Geforce cards show a small icon in the lower right of the Rhino viewports. In addition, the performance may be slow.
Problem: The nVidia Shadowplay feature has been enables on the newer driver. This is a video gameplay recording feature that can affect Rhino.
Solution: Disable nVidia Shadowplay while Rhino is running.
If you continue to have trouble, please post on our Shadowplay thread on the forum.