A new development, but basically still stuck:
1) *new step* exported existing library via File->Library->Export Library
2) uninstalled itunes, apple support update, apple mobile support, bonjour, apple app support
2) *new step* renamed existing itunes folder "itunes_original"
3) reinstalled 12.2.0.145
4) *new step* re-added all music, video, etc. via Files->add folder to library
5) *new step* imported previous library via File->Library->Import Playlist
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6) The result was goofy (some files missing, playlists missing files, etc.), so I a) quit itunes then reverted to the original setup by b) renaming the new itunes folder "itunes_corrupt" then c) renaming the "itunes_original" folder to "itunes".
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7) re-launched itunes to verify all was as it should be.
8) attached ipod classic #1, WHICH ITUNES RECOGNIZED, but would not sync... "The ipod "XXX" cannot be synced because it cannot be found" and I was unable to either click on the the device icon or explore the device menu...
9) ...nor was I able to restore... "the ipod "XXXX" could not be restored. An unknown error has occurred (1437)".
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10) #8 & #9 happened with both of our ipods.
11) now, again, when either ipod is attached windows will recognize, but itunes will not.
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Has anyone else had a similar expereience and been able to fix your way out of it?
Thanks.