This happened to me also and here's my solution. My problem was that I couldn't even create a new account or log into ANY OKCupid account from my computer or phone. I tried the deleting cookies and history solution and it didn't work. I still couldn't create a new account. I finally figured out that they were banning my MAC address as well as banning my login name. So the solution is to follow the delete cookies and history process AND to spoof your MAC address, all at the same time. Then DO NOT log into your old account. Create a new account. If you try logging in to the old account, they grab the new, spoofed MAC address and ban it! You then have to spoof a new address, which gets to be a pain. I also removed the OKCupid app from my phone and re-installed it. It is now able to log into the new account. Would be curious to know if this works for others.
