This is not exactly a bug, but a technical problem nevertheless. My electricity was cut off for about 15 minutes, apparently because of a storm, on the exact moment I clicked to join an MC. Now when I try to log in, I'm first taken into a trade screen, then I get a notice of being challenged by ??? and then I'm taken into the login screen again with a message: "couldn't connect". All of that happens within 2 seconds... Weird.

EDIT: I tested and the same happens with all my other (inactive) accounts too and I also cleared all my cookies related to theFarWilds in any way, to no avail.

This is a caching problem with flash. either try from a different browser or try something like:
http://thefarwilds.com/flash/thinflexclient.swf?sdjg

Thanks, I don't understand why, but it really did work to change the url.