I have had the odd problem in the past.
I generally use an app like
AppCleaner to remove the app properly. Dont just drag it to the trashcan.
Then reboot,
Then reinstall by pointing to the IP address of your Sooloos and downloading the latest version.
I tend to use
XLD for ripping CD's, though, rather than Control:Mac, which has always been very slooow on my machine. Then import the flacs using Control:Mac.
xld seems to be very good, but it doesnt do the magic of downloading hires album covers like dBpa does. You have to do that manually which of course is a pain in the uk since albumartexchange has "stopped working".
Cheers
Greg