Wish I had an answer for you. I am a Reaper Guy and am not having this issue. But all I got is questions. All which may be totally unrelated.

Why is the video so blurry? I really wanted to read each detail and that is not possible? There are wonderful free high res video screen capture apps available.
Why do I hear what sounds like a click track at the onset of the video? Is something else running audio?
Do you have the most recent version of the BIAB-VST (that is one of those things which is too blurry to read). You say you do but I wanted to verify.
I think you are showing us that the .mgx songs files already exist on your computer. Are they present in a place the VST is looking? Check your preference setup. Or can you start a new file in the VST without crash?

I wish you the best.

Dan

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6