Been having trouble with Audible the last few days. I sometimes can and sometimes can't log in to audible.com while using a VPN (and sometimes only certain pages will load when I can), but I can never download any of the titles in my library - either the page times out after clicking the download button or redirects me to audible.com/howtolisten. (Yes, the option to check for Audible software was disabled.) At first all I had to do was log in using my real IP, but then later I found that I couldn't download even then: it would keep redirecting me again to the "howtolisten" page. So... to make a long story short, I had to download using my real IP via Audible Manager. I'm mentioning the latter problem because I'm not quite sure at this point if the inability to download was caused by using a VPN, or if Amazon/Audible is trying to force everyone now to use their Manager, or if it's a couple of issues occurring simultaneously - or if something in their system just isn't working right at the moment. BUT.... I also have an Audible UK account, which I can usually log-in to using just a UK IP, but now I could not log in to audible.co.uk after repeated attempts and trying several UK servers - the site would just not load at all. I did finally manage it by also using a UK dns, something I've never had to do before.
By the way, Amazon.com and Amazon.co.uk: no problems logging into those sites, and so far I haven't found any pages not loading on either, although I haven't yet tried to purchase anything while using a VPN.