iTunes, music, "For you", Browse, and Radio do not respond
iTunes (12.6) os x 10.11 el capt.
The music windows for "For you", Browse, and Radio do not respond. everything else functions OK, at least to my knowledge.
I've a few macs (2 air's, and a mini), I've an issue with the mini(6 intel 17) running el capt. The hardware is a few years old it has a hard drive as opposed to solid state storage, and it is a bit slow to respond at times; shutting it down and restarting has always worked in the past. But now this fall back fix doesn't work and it refuses to run those 3 functions.
The other macs running el capt. and high sierra using a slightly different version of iTunes 12 all work.
What kind of bug would interfere with those three functions on the mini?
Mac mini, OS X 10.11