Grey trail when moving mouse cursor

Have I got a virus on my Mac when i get a grey trail when moving the mouse cursor? Please advise.

This is not malware of any kind. What it is is uncertain, but it sounds like a very serious low-level problem. I assume this gray trail is left indefinitely on your screen, unless a portion of the screen is redrawn? Try taking a screenshot by pressing command-shift-3, then open the screen shot file that appears on your desktop. Does the gray trail show up in the screenshot? If so, can you post the screenshot here? (Click the camera icon in the editor toolbar in a new post here and attach that screenshot file. Make sure there's no sensitive personal information showing in the screenshot.)

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