I don't know where to find crash logs if there are any.
Uninstalling the latest build and reinstalling still has the same result (window tries to pop up for a split second and then it's gone and the game is no longer running).
The demo also behaves the exact same way.
After reinstalling build 39 and running it again, I can see I have borderless selected in the options. I don't know if that could be a factor but I don't really have any ideas what could be the cause.
All I can say for sure is that some change between 39 and 40 must be causing it.
I did notice there's two save folders for Bring It On in AppData\Roaming:
Axol Studio, LLC\BringItOn - with 2 files: axol-bringiton.sol (1.4kb) and flixel.sol (126 bytes)
Axol-Studio, LLC - with 3 files: axol-bringiton.sol (1.4kb), BringItOn.sol (126 bytes) and flixel.sol (126 bytes)
I doubt that has anything to do with the problem but it seemed strange there were two save folders for the game.