There's something wrong with PayPal right now, that's preventing people from being redirected to Telltale's site at the end of the transaction. I have asked our ecommerce provider to look into it for us. In the meantime, if you have this problem, your order should straighten itself out within an hour or so. You'll get an email confirmation and the order will show up in your Telltale account when the payment has reconciled with our system.
If you don't want to wait or if it's been several hours since you placed the order and it still doesn't show up in your account, email us and we might be able to push the order through manually.
Sorry for the inconvenience. :( I'll post here when we have updates.
EDIT: This is supposedly no longer a problem. If it happens to you, please let us know.