Given that the OP and the only other person to confirm a paywall are from outside the US, and Wikipedia states their 2011 paywall affected "non-U.S. visitors who want to read more than about five stories within 30 days", I tried accessing the site through an Australian proxy server.
Since it was a free proxy server, it was slow and intermittent, but after I clicked through a few (maybe 5) different articles, a translucent black overlay covered the screen. Nothing ever appeared on that overlay, but I'm assuming that's some issue with the proxy, and it probably would have asked for my $0.99.
I still didn't see any sort of login information on the main page though, which seems weird. If I've payed my money, how does the site know that?