Updated vis FSDT tonight prior to starting sim. happened again. ive attached a new log. However this time coutar allowed me to restart.
No, it hasn't happened again, you have a completely new error that doesn't have anything to do with the previous one. The error seems to indicate you had so many passenger visible on screen at the same time, that it managed to exceed the maximum number of audio resources allowed in the audio driver, which of course never happened to anybody in years.
However, you log show something strange, which is ANOTHER Add-on continuously setting the passenger number, as it was in a loop, which is obviously wrong, since the passenger number set by external Add-ons should be done only ONCE, before GSX needs it.
If that add-on is setting it in a loop, while passengers are being boarded, it's possible the boarding would never end and, in fact, your PREVIOUS error happened during an Exception handling, meaning something it should never normally happen, and it was made to prevent the "infinite" number of passengers, which would normally happen ONLY with some of our airports that have walkers inside the terminal walking forever so, to prevent they would exhaust resources, once they reach a certain number, no new people will spawn and the existing ones will walk forever, until you exist the airport.
So, it seems the real reason of both errors, is that some add-on is causing normal Boarding passengers ( which cannot be "infinite" by definition, since we know how they are ), by continuing to set their number in a loop, while the boarding is progressing, as if they were infinite.
Are you running some kind of automation script made by somebody for GSX ?