I've come across this strange control issue just after starting a level. I can move just fine for about 10 seconds, but it doesn't matter which way I go, the guy starts running like he's stuck in quicksand. He does the action of strafing left and right but can't actually move and if I press jump he either acts like there's a ceiling right above him or he jumps up and can't come back down for a few seconds. It's rendered the game completely unplayable.

I am having the same issue, except that ultimately my guy ends up not being able to move forward at all. It's maddening! Issues started popping up halfway through the obstacle course in the tutorial, and by the time I was going to weapons training, I'd lost almost complete control, the ground textures on the range were missing, and on-screen text was jumbled and illegible. Had to use task manager to get out of the game.

Were you ever able to figure things out? I'm really not having a good time.

THANK YOU!!!
I think I must have tried everything except for this combination.
Game works a treat now.