HTTPS can't be the problem, the website of the bank where i have my bank-account is https and even google.de is https. I have more problems reaching sites which are NOT https (chrome and my security suite ask me both in that case if i am sure that i want to visit such a insecure site xD).
Ok, i tried again to buy coins and suddenly only 1 button was not functioning.
Its still impossible to buy coins for only $4,99, but you can buy coins for $9,99 or you can pay for a subscription.
I have no clue why this suddenly works, i didn't change anything in my end.
