7.9 won't start 0n 10.10.4

There's a problem with your configuration: LMS tries to write to the
disk's root directory (/cache). That's utterly wrong. Did you install
LMS under the account you're using to run these tests?

Please search the forums for problems with OSX and permissions. 10.10
introduced problems with permissions on the ~/Library folder (and
sub-folders). There should be three SB related folders for which you
need write permssions:

~/Library/Application Support/Squeezebox
~/Library/Caches/Squeezebox
~/Library/Logs/Squeezebox

--

Michael