That is BS. No website is incompatible with an ISP. Data is data.
You're running a Mac, as am I, so try this:
Open up a Finder window, go to "Applications" (under the "Places" heading on the left), then "Utilities", and "Network Utility". Choose the "Traceroute" function, and plug in "azbilliards.com" and start it up.
Once it's done (and it may not fully complete, we'll see), copy the results and save them to a text file. As it seems you're having trouble reaching AZB from home, email yourself that text file where you can get it later (like from work - I assume that's where you're posting from), and then post the results.
Do the same with "forums.azbilliards.com" as well - they're separate boxes on different networks (note the vastly different IP addresses below).
Then once that's done, check out this article:
http://forums.macnn.com/92/networking/121363/whats-mac-equivalent-hosts-file-windows/
and plug in a couple of entries on your machine using these domains and IP addresses:
azbilliards.com: 140.99.28.10
forums.azbilliards.com: 69.16.142.150
and then see if you can't hit the sites with a browser.
If that works, compare the IP addresses in your traceroutes with the IP addresses listed just above. If they're different, then it's likely the cause is faulty info in the DNS servers you're using. They're telling your computer to look in the wrong place for the sites you're after. Plugging in the info above as described in the article I linked above basically short-circuits this problem.
