The original implementation assumed that the UUIDs were coming through a strings, but this was changed at some point to use the 16-byte UUID format straight out of MSF.
This was causing issues when UUIDs had null bytes in them because the UUID was being truncated and the result was that UUIDs that were being parsed in MSF were too small, resulting in exceptions.
Migration now works again, and supports all the transports while migrating as well. At the moment we don't have the ability to take extensions across as well, though that might come when we have fixed up the issues with stageless meterpreter.
Creation of transports for switching is done a little differently now. But the transports do cycle correctly now when things fail, each with their respective retry times.
