Yeah, the x10 switches seem to be rather 'delicate'. A lot of people would love an alternative to x10 that is more reliable and doesn't have such a problem with signal loss.
We don't have drivers for the Marrick system, but would be happy to add them. We have released a new "Generic Serial Device" that makes adding most RS232 control devices (like the CM11A) a really fast and trivial matter. And Pluto has a 'remote access' feature you can turn on to allow our developers access to your box so they can test/debug drivers with you, since we don't have a Marrick system in our office.
So the bottom line is, no we don't have drivers for it, but if you get the system, we will write them for you and probably be around to turn them around in about a week. Or, if you're a developer who wants to take a try at it yourself, we'll provide tech support and plenty of assistance.