It might get blocked due to the way of obtained the card. Even it shows balance sometime you can't use this. You need to call the support and get the exact reason on what happened to the card. Mostly you can't do anything if that card blocked due to some fraud. For Paypal it won't work i think. You can check with some other merchants for ensuring the card acceptance.
The problem is i'm not in USA. So i can't call OneVanilla cust. service.
I need help for someone who live in USA and can call OneVanilla cust.service and tell me what happened with the card.