Static Windows 10 Screen after launching Parallels

[Parallels User]

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[Alfena@Parallels]

Hello @BarrieB , On checking the screenshot we see that Parallels ToolBox is launched not Parallels Desktop hence please open Finder > Applications > Launch Parallels Desktop > Start Windows and then check if it works.
Thanks

 

[Parallels User]

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[Parallels User]

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[PaulChristopher@Parallels]

FYI, I later found this posting for the identical problem with the solution that also worked for me. Good to know. Even more incentive to update to Version 13
http://kb.parallels.com/en/123094

Yes @BarrieB, the issue with the guest OS. Glad you came to know the root cause of the issue. Feel free to reach out anytime and we are here to help!