Hello Sketchers!
During last week's 'Play with the Devs' session some users were experiencing a frozen loading screen when trying to join an ongoing match. This ended up being a bit of a tricky bug....
...but we were able to knock it out. Hooray! There shouldn't be any more frozen loading screens.
To update:: open the game properties in the Steam library and click on 'Check the Cache Integrity' in the Local Files tab.