.... Well, managed to back track to ver 1.0.9.1, reloaded wrapper etc etc and all ok as before with only the very shortest of video micro stutter randomly, which I lived with ok because the rest of the players capabilities are excellent for me. Reloaded 3.0.1 again, but not the re-set button / front on-off button method .... instead still used the usb stick but selected the drive method from software and loaded it that way with no problems. Re-installed Kodi 15.2 + Wrapper and all ok with full remote functions as before. I still see the odd video micro stutter as before so I need to do a bit more digging to see if I can track the real cause down.
It does seem a bit faster on operation I think, but not had chance yet to test any 3D content out.
Wether this is just coincidental or what, but during all this firmware swapping re-installing etc, my Synology NAS has thrown up a disk error which it is in the process of doing a repair on itself ??.