The problem is that every port below 1024 is treated as a protected port under Mac OS X. This means that they can only be opened as root. As a regular user you are forced to use a port greater than 1024. Just use any other value > 1024, then it works. Regardless of rights, etc. Unfortunately, there is a problem on the Mac when changing the port from the GUI. Therefore, chose a port > 1024 in the register file 'picapport.properties'. Then it should work.