Did you make sure your paypal address was spelled correctly? Last week a couple of my transfers didn't go through because I had spelled the email addresses wrongly, so maybe you should bring that up with them in the best case scenario type thing. Ask them what the transfer looks like, and if they come back with a 'pending/cancel' option [or something close] then there was a spelling error, and they transferred it to an non existent account.

I hope that's the issue, because no artist should be skimped out of they're payment.