Tried to buy coins through Paypal for Word Chums, it use to just send me to paypal and I'd put in my..

Tried to buy coins through Paypal for Word Chums, it use to just send me to paypal and I'd put in my password buy them and then I'd go right back to my game. Now it just gives me a big run around asking the same questions over and over and won't let me buy anything. How can I fix this?