Ok Doug home now...
Looking at Tour MFS0006 RTMM Craig District Cabins (USFS4)
Leg 03. VFR Waterfall Spb (KWF) to Port Alive *16K Correct?
Firstly, did you have any issue with Leg 2, Landing at Waterfall Spb (KWF)? If no problems it is not your scenery. (Now I saw your pirep for leg 2 and all looks fine EXCEPT that you have a very Old version of FSUIPC for MSFS. (You are running FSUIPCv7.003 so suspect that could be the problem or a big contributing factor as to why you can't load flights or experience CTD trying to load).
Latest version of FSUIPC is v7.3.23 for MSFS [ONLY] (especially after SU12 last week).
If there is any add-on/App that you should keep up to date it is anything that connects to your sim like FSUIPC. Also not sure if you boot MSFS as FSUIPC simultaneously but don't recommend it unless you have to load it for your controller assignments.).
Anyways, start off by uninstalling FSUIPC 7.003, Install FSUIPC v7.3.23, and when starting your sim, use the MSFS Start only (if you don't use FSUIPC for your controller assignments.). You can get a shortcut for MSFS only from your xbox app.
After MSFS has fully booted up, then start FSUIPC v7.3.23 and then after your flight has loaded start cigar box etc...
To test KWF again, activate RTMM scenery stuff, then turn off any other add-ons (that could be causing CTD), them and boot the sim and go to KWF and hopefully there will be no issues but if some please report.
I have just started SIM and tested KWF and there is no issues.
Norm