Ah, I see the 'enter full screen visualiser' feature is also broken... and not sure when they removed the small/medium/large screen options for it, but I used it occassionally so it didnt clutter up my iTunes options and selections.
On the remaining working plug ins, they are inert, not responding to music at all as if itunes was sitting idle. I see I cannot access settings of any plug ins like Gforce to tinker with prefs. Also, using mouse instead of keyboard commands for all the above likewise doesnt work.
Now what, Apple?