If it's related to the license server, start a Mathematica session, then launch a separate Kernel in a terminal window with

 math  -lmverbose 

The -lmverbose will make it print the kernel's view of the traffic with the MathLM.

You might need to start the separate kernel multiple times to get something interesting. It would be helpful if the MathLM were logging its traffic, too. (MathLM command-line options are in http://reference.wolfram.com/language/ref/program/mathlm.html, under Details.)

If you do get a crash with the terminal Kernel, send us what information you have including error messages.