I installed Emu 2.3 on OSX 10.6.4, but couldn't manage to get anything in the main "Databases" List for a while.
This seemed to be due to a wrong permission setting during installation, on the /Library/Emu folder.
I ran 'sudo chmod a+rx /Library/Emu' and everything was fine.
By the way, this folder was created on my machine with a different existing user than myself as owner. Strange...