Colin, yes ...
... I recall it too.
This could be a kind of deadlock situation, or maybe not ... Please try this :
Boot into Normal OS and hope all is fine right from the start in there. If not, try whether you can play Unattended with the current "Services Shut Down" settings. Maybe that works. If you then bring up XXHighEnd it can (or should be) fine again (after pressing stop).
If it still is not, there's the OSIsW8.tss (etc. etc.) files (I do this from the top of my head and can't look at the moment). BUT, this has not been made for W10 yet (stupid me, because I thought about it and thought "never mind for now. And you use W10, right ?). Rename the W8 file to *.tst. Now try again. Almost all should be fine.
Boot into MinOS and try whether things are OK-ish in there too. If so, rename the file to *.tss again and see whether it stays OK (and now shows W10 again).
If one of the parts fails on you, just let me know. Don't try too hard (don't waste too much of your time). We'll get there in another way (via email).
Peter