I always get the error message "You or your opponent disconnected :(" before a match start, even when I select single player.
Just before that, I can't seem to be able to select a bot. And it might be connected, but even in the bot select screen I can still "select" things on the menu even though it doesn't appear .. here's a screenshot so it's more clear:
Oh and I'm on windows 10.
I'd be glad to answer any question if there's missing information to help you debug.