It is strange, no matter what I try when I click on the 'connect to printer' button, my repsnapper crashes
Hi Geoff, sorry to hear you are having trouble. It's probably galling to hear from someone whose setup worked 'out of the box'! Some suggestions:
What version of OS X are you using? Up to date? In the FTDI VCP driver package there is a version for OS X 10.3 and a separate version for 10.4, 10.5 and 10.6 - is the right version installed? And up to date (mine: 2.2.16)? Does it show up in the System Profiler? Version of repsnapper (mine: r352M Darwin i386)? Have you tried the board with nothing or just one motor connected? What port speed/baud rate (mine: 19200)? Try different USB cable/USB port? Disconnect all other USB devices? Another thing might be to set up a new user account on your Mac, try from there in case something is conflicting with the port, eg printer software. Or get an external HD, clean install OS X and boot from it. Alternatively, download Oracle's free Virtualbox http://www.virtualbox.org/
and install Ubuntu or Windows, and control it from a virtual machine (a WinXP VM also works for me). Finally, could be a knackered board? Can you test it on any other (perhaps known working) config?
Sorry if this is repeating lots that you have already tried. Hope something in there helps!