Dota 2 scroll up after ALT+TAB

Hello, guys!

Just want to inform that using ALT+TAB to leave DOTA 2 and then coming back to it makes the camera scrolling up stop working.

I can scroll sideways and down, but not up again.

There is a fix, though. Pressing that arrow on the top left hand side of the screen to to go the Dota 2 menu and then coming back to the game fixes that.