It's okay, these things come up. I tried the flags but they don't seem to have any effect. Sounds work, music works, and it chooses the correct monitor. But it still gives me a slowly flashing screen that shifts through what I expect is the dominant colour of the opening. No error messages other than that it can't preload those two files.
As for hardware, I'm running a 64-bit Intel i7-8700 with 16GB memory and a GeForce GTX 1060 6GB. If it helps, I'm running Ubuntu-MATE 20.04.