I recently installed synergy on my work Mac Mini. It previously had the hostname "jonesd-petro-macmini" and I ended up spending several hours in frustration. The reason seems to be a bug with hyphens. When I changed the name to "jonesd-mini" it works just fine.
The symptoms were: Status: Error: unknown screen name `jonesd-petro-macmini'
When I change it back to "jonesd-mini" it works fine.
I did change the name as appropriate in the "Sharing" preference pane in both cases.
Since I found this out and got it working, AWESOME, LOVE IT!!!