thanks for the feedback.

Is this on a Core Solo or Core Duo Mac Mini?

How much memory do you have installed in your Mac Mini have?

Since the Joost Behaviour starts Joost asynchronously and version 1.1 
of the Behaviour does no longer use any AppleScript that could block 
in the case that Joost does not reply to a message, I'm a bit lost as 
to what would cause this. High CPU or memory consumption in Joost 
(causing Remote Buddy to be swapped out) could be a cause, but this 
shouldn't go on for minutes.

Do you start Joost through Remote Buddy - or do you switch to the 
Joost Behaviour with Joost already running?

Best regards, 
Felix