I installed 6.3.6 Workstation and the 6.3.6 client on my OS X machine, and I’m happy to report that, at least as of +3 hours of work with a remote session, I’m no longer seeing the crashing behavior! I still can’t connect to the console session when I launch my NX client. But that was always less of a concern to me than the server software crashing and ultimately running my partition out of inodes. Thanks so much for your help! I’ll post any updates I have, if things regress, etc.