... is, that customers could not complete the order, because after the PayPal login they return back to the order overview and can't click on the "Jetzt bezahlen (Pay now)" button. The button is disabled, even if the checkbox of AGB (T&C) etc. are checked.
Curiously, the button is active and clickable before clicking a checkbox. After clicking one checkbox the button is disabled and it stays disabled. Its only at the payment method PayPal on Magento Community Ver. 220.127.116.11.
Is there any fix for this problem yet? German Magento shops still have problems with greyed 'Jetzt kaufen' buttons, T&C checkboxes and PayPal.
BTW.: PayPal seems to work fine! If you deactivate the requirement of the checkboxes, the order can be placed, as usual!
What about the newer version Magento +2.0? Does it the trick?
Here is an screenshot (German order process, after redirect from PayPal):