Is it possible to record a full video, including flight plan entry, and post it to YouTube so I can attempt to reproduce in the V1.8 beta version, please?
It's maybe hard to hear and easy to say, but the fact remains that your PC is basically minimum specs for X-Plane 12, there's going to be performance problems in some scenarios, maybe this is one of those times.
Laminar broke the window heating response and we are still waiting for a fix. In the meantime you can try a workaround script: https://github.com/pilsnerish/FlyWithLua-Scripts/blob/main/CL650_window_heat.lua
It might help the developer to hear what information you feel was missing from the documentation/assistance already provided with the aircraft files and in the sim (via the hint images and virtual first officer)? Thanks.
Like you said, a timing issue, those datarefs aren’t created until after the script loads.
https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests
Seems nothing to do with Challenger and everything to do with Resources/default scenery/airport scenery/Dynamic_Vehicles/Master Bank.bank being broken.