After the meat your match update came out, I started hearing reports of this black loadout box appearing at the top of the screen. It doesn't allow people to switch weapons while it's active. Anyone know what this is?
I am guessing that it is from not updating all the hud files or something screwing up in hudlayout.res. I recall having a similar problem but after I scrolled through all the changes in GitHub and updated all of my hud to get it functioning it went away, along with another black box at the top of the screen. Also have you tried binding a button to +quickswitch and pressing it down? That would be the other thing that I would try to fix the problem.