Could the slow import be due to a slow connection? How are you importing - via wireless network or direct connected storage or ? Now that you have a movie imported does to play?
Yes, the thought had crossed my mind, too. Though I only tried importing from an external drive via USB3, and from an internal partition (SATA). And yes, the movie (and music) files once imported play A-OK, no issues at all there. In fact no other issues as far as I've noticed to date.
There was the one minor issue where JRiver wouldn't start always with Win10 (I had that set in the start-up options to 'Media Centre'), but once I changed that to 'Media Center and Server' (just to see if that made any difference), JRiver started up with Win10 fairly reliably.
One other issue with the latest JRiver built I found is that when I start it in Mini View with Win 10, it stalls every time and just shows a fat, white bar at the top of the screen. Starting in Standard View or Last View solved that little hiccup.
Just to clarify why I posted here:
A) I do realise that Win10 at this stage is nowhere near a final product, whatever MS wants us to believe, and hence I'm equally clear that one can't expect all applications to run A-OK
BUT:
B) Other posters here seemed to have a better experience than I seem to have (not that I'm complaining, see point A above), and so I thought to see if anyone else had run into the issue that I had encountered.
On a hunch, here: How would one recommend installing JRiver under Win10? Any particular thoughts on this?
One more thing: just to see if I could make headways, I tried v18.0.180 under Win10, and found this:
a) v18 has no issues starting in Mini View with Win10
b) Still need to set start-up options to 'Media Center and Server' for reliable start-up with Win 10
c) Import times still incredibly slow but about a minute-plus faster than v20 (tried with the same movie and audio files)