Site logs me out when I try to shop or buy

When I log in, my shopping cart disappears. When I try to shop while logged in, I get logged out and dumped onto the landing page. Logged in and shopping for books seem to be exclusive states on Very funny! Why do you hate me?

I have opened my browser settings to full "Hello, Sailor!" for cookies, pop-ups, etc. with no change. I have flushed cookies and history, changed browser, machine, OS, location and method of net connection, from iOS to OS X to Windows, and still I get the same result. The common trigger is my log in credentials. They are correct, I do get in and see my past purchases, but I am blocked from making any new purchases.

Can you tell me how to get off the no buy list, or is this some DHS thing?
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