Crashed twice (seemingly hit the same crash twice) last night trying to join a server. Crash happened exactly the same way both times: joined server -> downloaded missionfile -> spawned mid-air above water -> CTD when hitting the water.

After each crash I had to re-download the missionfile. After these two crashes I switched to perf/prof (version 434) and then successfully joined. Could have been luck and nothing related to perf though.

100% vanilla, no mods or CDLC.