Hello, I've had this problem for a while now. I cannot remember which update since this problem began. However, I have sent feedback in-game about this but since there will be no longer updated to the free version of the game so I decided to ask if there is any workaround.
Here is the video explaining the problem. You can see that it blinks when I tried to change team by using a hotkey but no problem if I click it.
I have tried disabling mod, running without mod, reinstalling the game, changing the hotkeys but nothing work.
I'm running the game on Win7.
Thank you for making this amazing game. Have been following it since it is still compatible to play in WinXP 🙂