Here's the deal:
Entering RTB_TCPObject::onLine(21650, POST^1)
Entering RTB_Server_Authentication::onPostReply(20419, 21650, 20418, POST^1)
Entering RTB_Server_Authentication::postMods(20419)
this is the last 3 lines of your traced console, which tells us the crash happened directly after calling the RTB_Server_Authentication.postMods() function
presumably, this is the cause of the problem
try running without rtb for a few times, then redownload rtb and install it again, see if the problem starts up again
additionally, try running with all defaults AND rtb