I moved back to Windows 8.1 to see if that was an issue, and while I could get the Roon app to fire up, the graphics on all the text was little black blocks. This would suggest (thanks Russ) that there was a graphics driver issue …
So, with the Roon app opening up again I re-upgraded back to Windows 10.
Now - the Roon app opens up eventually, but I’d say the boot up time is around 90 seconds… The graphics are back in place.
However - the scanning and updating “whirly wheel” on the top right of the screen is still spinning, even though the library was fully imported some time ago. It’s gone back to Adding Music to Library which I thought it had finished ages ago.
Worst still, I can now browse, select, drill down and play, but the playing of any music to my ID41 and M system lasts about 5 to 20 seconds before audio stops. The Roon app still looks as though it’s playing (it has a pause button not a play button) but the music playback stops. Checking another track and clicking play results in nothing.
Currently it’s playing - but having has Sooloos for the last few years I’m certainly not enjoying the lack of stability…