We have a number of players that cannot slot in on the lobby screen after the first mission after a server restart. In the lobby, when the slots are displayed, clicking on a slot does not do anything, but dragging via the admin works. This only seems to happen after the first mission on the server was played.
While this does not happen to me personally, I can observe a similar issue when using "play in multiplayer" in the Eden editor. When returning to the lobby screen, I am unable to change role unless I go back to Eden itself and then re-start the mission; otherwise, I am stuck in the slot I occupy.