Quote from: CIYAM Open on January 21, 2013, 10:40:25 AM

Quote from: epeenor on January 21, 2013, 10:37:24 AM

Transactions (Newest First)
No transactions found for this address, it has probably not been used on the network yet.

Yes - this is the relevant part - no tx has been detected - it would seem fairly likely that if after 30 minutes it does not even see an "unconfirmed" tx that the tx didn't actually occur (you did check "both" addresses?).

Tl;dr: your bitcoins are not sent by the seller yet. Try contacting the seller.