Sorry if this has already been posted - I searched and checked the previous compilations and didn't find it. Finished playing a round on shazbot3, then back in the lobby shazbot3 counted down (30, 20, 10 seconds) then said it was changing. Then I clicked the Ready button. Below is what happened next.

I found that anytime I switched applications or clicked on the Start menu, it would correctly return me to the lobby. But even after clicking "Resume Game" there it just did the same. Eventually I clicked on the Next Game button, and below was the result...

Again I could return to the lobby by switching applications or clicking the Start menu, but clicking "Resume Game" just returned me to that state. Leaving the party and rejoining resolved it.