For some bizarre reason, they simply dropped my bountyup.com domain name overnight. It still showed up in the web interface, but their name servers wouldn’t answer any queries for it. (And no, the servers weren’t down, as other names I had registered with them worked perfectly.) So I’ve left them.

I’ll be on the lookout for another simple, free provider, but in the meantime I’m back to using my father-out-law’s DNS servers (in Iowa, of all places).