I have reported this via email and also followed the instructions laid out elsewhere in the forums to send in the report.zip. However the report.zip is over 140MB and your email server rejects the large file.
Anyways, when playing multiplayer with my nephew whenever I attempt to quick-load, load, go to main menu the game crashes or locks up. If it locks up, as soon as I ctrl-alt-del, it crashes. This is only in multiplayer.
I have made a new single player game and played fine. Quick-load, load, main menu all are fine. As soon as I mark it as multiplayer to allow another player to join, the crashing starts again.
It also happens regardless if another player even joins or plays. Just creating a single player and trying to quick-load, load or main menu it's fine. Switch to multiplayer, immediately try to quick-load etc and crashes.
When it crashes it's always when it's "cleaning up session". Not sure if that helps.
I have been hoping for a fix since release. It's very time consuming to crash, reload, reconnect multiplayer everytime you need to quick-load.
If there is another way to provide the report.zip to support besides their email, please let me know. Btw I did not get a response from my original support email.