I already had a thread about but it vanished after the new forum was set up...
Anyway:
The problem/issue/bug is now a little bit different; previously the renewal page didn't exist at all. Now, I'm gettting "API_NOT_RESPONDING" & "Application is not responding as expected." errors when I try to renew for 14 more days.
NS 2015 b103 -- Windows 7 SP1 x64