So, I can't get them to work together. NT lasts about 15 -60 mins and crashes, with no obvious error in the trace/logs.

This is the crash:

Faulting application ninjatrader.exe, version 6.5.1000.7, faulting module ninjatrader.esignal.unmanaged.dll, version, fault address 0x00009ac1.

Yes, I've done all the re-installing, cleaning stuff out, starting from scratch. .net etc etc.