REBUILDING iTunes library from scratch over two days got app working again. Fine use of lazy weekend.
Had to sacrifice all custom playlists dating back to 2002, including An Event Apart playlists and delivery room mix from Ava’s birth.
Playlists still exist on old iPod but can’t be copied from it back to iTunes. (All software I’ve tried freezes & fails.)
Playlists still exist as code snippets inside .itl file in old iTunes folder, but numerous trials prove iTunes can’t launch from that folder any more. Thus I can’t temporarily launch from old folder, export playlists, switch back to safe new folder, and import them, thereby saving them.
And iTunes can’t import old .itl files. I Googled. I tried anyway.
13 years of custom playlists. From before, during, and after my marriage. Including one my daughter called “princess music” and danced to when she was three. Gone.
But, really, so what? Over time we lose everything. This loss is nothing. Attachment is futile. Always move forward, until you stop moving.