Just wanted to let you know - Running Linux (Ubuntu 13.10) 64 bit edition, KSP and DarkMultiPlayer works beautifully on both KSP 32 and 64bit version. Only issue is Intermittent: on connecting to server at the end of loading the vessels it hangs... but only sometimes, think it may be related to a specific vessel on that server, but since i'm a client and not host i couldn't say. logging into other servers is no issue.