ensure you also have everything needed to play(.net, xna, etc)
hm I'm not sure, I'd have to check that version and see what's going on
truthfully, with the rehaul in progress I don't know if it's going to exist in the advent of the new version(since no one reported this problem before). A shitty response, I know. However, you can join the beta testing group and try out the newest version(or can just join the server to see what's going on)