Unfortunately, if there is a way to “undo” or “rollback” I don’t know how.
I had a few false starts, each time getting a bit further. But what I did was uninstall GitHub, VirtualBox, and Vagrant paying more attention to things I might have missed before and trying things a bit different. (and yes, upgrading gems was one thing I tried)
The first “successful” attempt ran painfully slow. I believe it was because I installed everything directly under C and Windows had a security / privilege problem with that. At least I think that was why I had “sharing” problems.
That, and I was opening the shell from the GitHub GUI
Then I upgraded to Windows 10 and everything broke, forcing me to try again.
This last time, which knock wood has been running well, I:
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installed GitHub - used all defaults
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installed VirtualBox - used all defaults
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installed Vagrant - used all defaults
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instead of putting my “work” under C I put it under
C:/users/[me]/documents/virtualworkspace/discourse -
I open the shell from the Start menu - GitHub - Git Shell
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I don’t touch the GitHub or VirtualBox GUI
It takes a bit more effort cd’ing to the work folder, but Windows hasn’t complained yet.