why is half the music on iTunes on my iMac greyed out?
why is half the music on iTunes on my iMac (I think mainly tracks imported from CDs) greyed out? I can only play single tracks but not the whole album or even a set marked as a 'grouping' in Itunes info. I've tried reverting to my pre-update library (as suggested in http://support.apple.com/kb/TS1967?viewlocale=en_US), but it doesn't help.
No idea if it's connected but the update also changed my iphone settings to autofill and I think made one or two other unwanted changes. But this seems to be a problem with itunes on my imac
All advice gratefully received!
iMac (21.5-inch, Late 2012), OS X Mountain Lion (10.8.5)