I get this message when trying to join some servers. Is this a test version or something?

Apparently a more or less private test patch - maybe just for the developers' internal testing.

Private? Nah, i'm running X10, it's compatible, too.

I had this too. Through the game menu, click multiplayer and try to join one of the servers. Game updates, all is dandy.

http://www.lfsforum.net/showthread.php?t=27420

Full topic on it, listening changes and so on.

http://www.liveforspeed.net/fi ... me=LFS_PATCH_X_TO_X10.zip

The patch

Its compatible in that X10 can join X2 and X servers, but if you dont have x10 you cant join x10 servers.