Hi Steven. just to let you know, I tried everything you mentioned to no avail. Eventually resorted to re-Install, still the same result. Luckily I backed up everything before the install.
I then did a Window 10 update (Windows only found 1 small update outstanding)and Voila!! All good. Must have been a Windows issue, but very strange that MusicBee was the only program affected on my PC.
So replaced the backup and all seems ok
Thanks so much for your help, much appreciated, and apologies for wasting your valuable time.