You can't currently pay with PayPal in the shop ... "there is a problem with the email address registered with PayPal for this merchant" (well, something like that ... didn't think to copy the exact error message).

Something for MT to sort out I guess?

EDIT:  I just checked my email and I've received an order confirmation ... but when I click on the link in that email it just takes me to the main forum page ...

I fixed it - forgot to setup the paypal thingy right.
I should not work, thx for report.