My first try with RepSnapper, spent most of today debugging and wondering why it connects but leaves the printer motionless. Both my 2Gen Sanguino electronics RepRap and RAMPS 1.2 Milling machine stayed put.
Ultimately it turns out that /dev/cu.usbserial-A6008sa0 works and /dev/tty.usbserial-A6008sa0 NOT. Googling learned the cu* and tty* indeed differ, but I don't think I fully understand yet. Over two years used the tty* in ReplicatorG without a problem. Anyway, for those that are as puzzled as me, this may make the difference.
Intel iMac, OS X 10.5.8
Compiled Git master from source and dependencies installed w Macports