Then I connect my iPhone and launch iTunes. It says "updating library". OK no problems, this is a regular occurrence. But, it never completed. Even after 2 hours. iTunes was un responsive so I force quit.
Re-launching iTunes I get "The iTunes Library file is locked, on a locked disk, or you do not have write permission for this file".
Hmmm googling suggests that this can be fixed by copying / moving the Library file and copying / moving back. Tried that and now I get "the iphone
So I called Apple and they had me use the version that gives the 'in use' message. But how to fix this. After quite a while holding, they say, restart your Mac. So I did. Crashed on shutdown, and then on restart, all is OK.