No, the Forums were not deleted, they have just not ported over to this new version...
Although, (weird) it DID in one Group!
I had already run the GJ Tools, and it seems to claim all is fine.
The last part of the Tools states:
:: GroupJive :: Previous release database found - Migrate | Delete
However, on pressing it, it meerly duplicates the Groups again.
So the actual Groups get doubled, and the message remains the same. Although the Forums do not import.
Yes, I know about the disabling etc of the Forums, it is not that.
The Jitter is just an adaptation of What Are You Upto.
So it is far from crucial, it is just a small notice system really.
That has been at least temporarily solved by publishing it only to the menu items other than the Forums. So it at least doesn't conflict.
But if I'm the only one with Forums import issues, then it is obviously something lame on my part...
I will continue to try.