Followup: I've discovered that I can connect to the Mithaniel Marr server without any problems. The success rate for logging in and entering the game world is astonishingly high -- the only disconnects I've gotten were strange ones that seemed symptomatic of a different problem, wherein I would get slammed with "YOU HAVE BEEN DISCONNECTED" right after clicking on "Enter World" in the character selection screen, but those were the exception, not the norm. Also, I never crash while zoning on that server.
This suggests that my problem is server-specific, but it doesn't help me much in terms of figuring out how to make it possible for me to play on other servers.
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