Glitch in Pay Per View paywal: Allows viewers to access content free (part 2)

Hello. A reader of mine has found a glitch in my Pay Per View paywall that allows viewers to access all of my content for free (and presumably anyone else's content who is running this software). The glitch is that the paywall does not kick in when viewers access the content through a tag or date URL extension.

I thought this might be because I had my settings allow for search bots to see the full content, but I then switched this off and was still able to access the content for free (and yes, I did have my admin access limited to not seeing the full content). I've also tried deactivating my WP Cache plugin and reverting to the default Twenty Twelve theme but neither of these has worked either. Below are a couple of examples of extensions where the content can be accessed for free (first a tag extension, and then a date extension).

http://newbooksinbrief.com/tag/jeff-stibel

http://newbooksinbrief.com/2013/08/

I consider this a major issue, and fear it may affect others as well. This is my second attempt to contact support to troubleshoot this problem, and have yet to receive a satisfactory solution. Please help! Thank you.

Aaron