I guess it should be in bug reports, but i will post it here.
I got a game crash (ODE) when i was landing on my head. After that i couldn't connect to the EU server(s) anymore. While trying to connect i got a game crash or it just would stuck in the syncing for ever (and in the background) the game crashed. I tried pc reboot - router reboot - with mods and without mods - a clean reinstall - but still couldn't connect.
I was riding with the 250f and 450f on these server, then i changed to the 350f which i didnt test since the update and voila i could connect. I guess my profil-id/key or whatever got stuck on the server..
**update
OK - still can't connect even with the 350f i got a game crash now. Something wrong with the master server?