s1m0n

Yes, this fixed the problem joining the game! :-)

The suspicion is that the Ubuntu version of the game is out of date because it was downloaded from the Ubuntu app store. Am just downloading it again using these PPA instructions: http://play0ad.com/download/linux/#a0A.D.providedpackages Will post an update whether this works or not...

Just downloaded the Ubuntu, OS X, and Windows game and installed them. Want to connect these 3 via my home network. Here's what I tried: 1. Hosted game on OS X and tried to connect Ubuntu game to my OS X host. Ubuntu always crashed upon joining the game. 2. Hosted game on Ubuntu and tried to connect OS X game to my Ubuntu host. OS X connects to the Ubuntu IP and Ubuntu shows that OS X has joined. However, on OS X then I see the error "Unexpected map type: undefined". So it's impossible to start the game that I joined :-( The same thing happens when hosting the game on Ubuntu and trying to connect Windows game to the Ubuntu host. Any ideas?