I'm afraid that the problem was that our webhost (Powweb.com) changed the IP address of the server, which made the DNS lookup for the server incorrect. It took me a day to even figure out that's what the problem was - at first I thought that it was just normal downtime
I couldn't correct the problem myself because Arcanum (the previous host of WoD) owns the domain name, so he's the one who needs to make those sort of changes. We finally got things straightened out last night/this morning, and the fix is working itself out right now (though there's probably some people who may not be able to access the site for another day or two.)
I'm not quite sure what the problem with using the www before the address is. Arcanum may not have remembered to update that record, or it may simply be a caching issue. I'll look into it, though.