Yes I have enough lindens for the purchases, I've tried buying things that cost and buying free demos but still the same problem.
The buy now disappears after I click on it and the page doesn't go to the next one like it should after you buy something. The buy now button turns white (disappears) after I click it and there is no other option to pay for things.
https://gyazo.com/17299816ff584e69ac09493e6b59b1e1