Says they're working on it. I tried last night to get the free Walking with Lincoln: Spiritual Strength from America's Favorite President.
Today's title; Kiss Me Like You Mean It: Solomon's Crazy in Love How-To Manual—same thing.
FYI... I have not had any problems with the checkout.
Michael, try it from a different browser to see if you can work around it for now. If others are not experiencing the problem it might be configuration specific.
And that "There is a problem in our checkout system" message might be a generic one that comes up whenever there is some internal error. They might not actually be aware of this specific problem and might not actually be working to fix it unless notified by a user that they experienced the problem.
I cleared my Vyrso cookies, and… voila…
I can't load the Kiss Me Like you mean it on my iPad in either the Vyrso or Logos apps. Seemed to work fine on my PC.