Ureka....! All parts in the simulator.
My thanks to Wunsch (Michael) for help and diagnostics. Max materials were usually to blame. These Materials MUST be in 'standard' Max format. Different Materials will crash the Converter. Check your TM.Log (tm.log) for 'errors'. I was checking the end of the log for errors. My last couple of errors were on the front of the log, at the top. Run 'Find' (control F) and enter Error, and you should find your issues when having export issues.
Nothing animated yet. Working on that now, which means its own new TMD and TMC, which is not going to be easy.