I've recently been having an issue with with my arcade maps where 1 moment the lobby will be displayed on the open games list, and the next it won't be. However anyone who is still in the lobby including me remains in there, Thus the title "vanishing arcade lobbies". As you can imagine this makes getting enough players for any map that's not super popluar even harder. This glitch is somewhat random but its happened to me 6 times in 1 weekend.
However blizzard won't listen to an arcade issue unless a lot of people complain about it so if this has happened to you before, please report it here so blizzard notices and fixes it:
i have never seen such a bug. a lobby takes some time to show up in the open games list, but aslong the game hasn't started it doesnt disappear. it even takes some time to vanish after start (this lobby doesnt exist anymore).
maybe you are looking in the wrong category? maybe it's on page > 1 ?
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Oh yea, I've experienced it. In a 10 player map our lobby would sometime bug out and suddenly become invisible with nobody being able to join it. Think it first happened to me a few months ago around the time the player status bug appeared (it's when player status is displayed as green circle instead of sc2logo while player is acually in game).
Pretty sure it wasn't lobby splitting either, just lobby stopping existing while we're still in it. Derpy stuff, tho by now I'm not surprised by anything b-net throws at us.