OK Patrick - I’m learning more about this issue as we progress, and I’m glad you’ll work to resolve it in 12.
And, unsurprisingly, the issue of a real fix had crossed my mind. 
Your UTC explanations make sense in the larger user context.
If it’s important enough to try to isolate the update/group of updates which are triggering this error, I can start with a clean Gateway 11.ova reinstall and a from known set of initial VBox paramaters, and then start running updates/rebooting after each set, and finding out when/where it breaks.
Let me know if you think this is worth the effort.
CCP