Damn, I was hoping they were going to fix the black screen issue as it was a recent addition to the bug list. It should not have been that hard to fix since it was not there from the beginning, at least I do not believe it was. I started seeing it around L107 or L109.
Since you would have to be in PIP mode already to record from the buffer of both tuners at once from the beginning all you would have to do is swap tuners and press record and select that option on the other tuner as well, unless there is a bug that would prevent this from happening.
It is not too difficult to hide a PC's real IP address if the web browser is configured to use a proxy. The "guest" in question could have easily used a http proxy, or a SOCKS server in Canada to make the post.