Hi, I've the same here and Windows 10 report "PFPX has stopped working" 5 to 10 minutes since open. I don't know if Windows 10 the problem but i can remember in Windows 8.1 has freezes also. I can see in your video you have PFPX on Windows 10.
This is a fresh install of FSX and Windows 10 on a top end ASUS ROG Gaming PC 32GB RAM SSD etc.
TOPCAT also is being blocked always with PMDG777-200 when calculating TLR.
I just buy the bundle only for the PMDG 777 but TOPCAT is in beta without 777-300 for a long time.
I hope this have a solution as soon as possible because it's unusable for many users including me..
Thanks