Just tried. Still the same problem.

describing as detailed as possible:
from the cartographersguild/payments page whatever i choose there when i click on <order using paypal> it takes to the paypal login site. In the same browsertab, it should be a new one
When logged in to paypal, i have to open the guilds site again and go to support, make my choice again <order using paypal>. As now logged in i get a "page not found" at //paypal.com/...pagenotfound/

hope it helps