BIND issues since new cable gateway?

I run 2 dns servers (one internal caching one and one on my external web server which handles its name and local caching for that server). Neither server had forwarders defined. Yesterday I got an upgraded cable gateway and now the dns servers don't appear to be able to resolve anything unless I add forwarders. I can connect to the root servers and resolve stuff with nslookup, but the bind servers both fail. Any ideas?
 
Also, any ideas how to even start debugging this? Best I've figured so far is nslookup to the root servers, which i get proper responses from all. If I can nslookup from the dns servers, specifying the root servers, then why can't bind get to them?
 
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