Thanks for replying -- the client seems to work beautifully on osx here. It took some time to start showing post content, and I even restarted it once because it didn't seem to do that after a few minutes, but now it does, so that's good.

My NAT is apparently a restrictive one, since I've got "Mapping failed, no router, or router uncooperative" as my port mapping status. But as you predicted, I've indeed got some inbound connections, so yay.