Rhino for Windows
Recovering a lost or previous version of a Rhino file
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Update GPU driver and try again.
If still a problem, start Rhino in Safe Mode (see icon under start menu) and say no to loading plugins during startup.
It may complain about how it had to substitute a font. Resave file and see if that works.
Rhino for Mac
How to remove a plugin from Rhino for Mac
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First try the plugin method above if a plugin is suspected.
Close Rhino.
Open the user account's Library folder (Option + Go + Library).
Under Application Support, delete anything starting with McNeel.
Under Preferences, delete any com.mcneel files.
Start Rhino and see if it works. It will require inputting the license info again.
How to fix viewports showing red
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Quit Rhino.
Open the hidden user Library folder (not the system Library folder).
Delete the following:
\Application Support\McNeel (delete folder)
\Preferences (delete two com.McNeel files)
Restart Rhino.