YOU CAN NOT PAY BY CHECK.
THAT WAS A MISTAKE. IF YOU MAILED A CHECK... WHO KNOWS WHERE IT'S GOING. It was stated many times paypal is THE ONLY form of payment accepted. RickRay took it up with OCC and hopefully they removed the check part. if you paid by check, I suggest paying again via paypal and worrying where you check went after.
If paypal is not working, there are a few reasons.
1. You screwed up somewhere. All you have to do is click the link "pay online", enter YOUR paypal info and click send payment. You shouldnt need to enter any OCC info. It should take you there automatically. Once you pay, click "return to OCC" link. You will see a THANK YOU page from OCC. You are good!
2. Maybe paypal or OCC is having technical difficulties due to weather. Try again later.
3. Maybe all 3000 spots are full and they closed registration.