Well, just to provide an update on this as no-one has offered a solution, ...
Presumably because nobody else experiences this issue. So how could one offer a solution, other than to try the suggestion that Phase One support apparently gave based on your input.
I contacted Phase One support for advice, and was told:
"Please uninstall and load 7.1.3, I think you may have better luck with this version with Windows. Then, wait for the next version out to upgrade."
I've now done this, also in the hope of correcting some other issues as well, and no luck I'm afraid. It's not a feature that I desperately need, but for software this costly I'd expect all features to work.
That's what makes it difficult to suggest solutions, you apparently also experience other issues we don't know about. Maybe they are related.
Just a shot in the dark, have you tried disabling "Hardware acceleration" on the general tab of the Preferences? We have to assume you updated your graphics drivers to the latest, as presumably also suggested by Phase One?