I've seen that before too. It seems to be intermittent and the way I "solved" the issue was to start KeyShot then click the Render button in Alibre. Once the model opens in KS it seems to act normally the next time I need to render a model.
My recommendation is not to use subsequent changes. (Windows )
Uninstall KS, download KS V9.2 and carry out the installation with the necessary settings.
It takes 10-15 minutes, so it should not be a problem.