Colors don't display in shaded mode

Shaded mode won’t display surface colors. (It works in ghosted mode)
Display settings are set to defaults.
I tried activating/desactivating opengl harware acceleration, no change.
It happened suddenly a week ago, it is quite annoying for me…
Thanks for your help!

(Rhino V6 / windows)


check if the video drivers are updated

Thanks Diego, you put me on the right track!
Drivers were up to date but windows was using only the intel graphics chips, not my nvidia graphic card.
I desactivated and reactivated nvidia graphic card in teh control pannel and it solved the problem.
To check which graphic card is used by windows:


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