I have my DNS manually set to Google DNS (8.8.8.8 and 8.8.4.4). Sometime in the last three weeks, MWB decided it suddenly wasn't going to let it work anymore. If I set my DNS to automatically get a server from the router (192.168.2.1), I could browse just fine. As soon as I set it back to Google, I wouldn't be able to look up any IPs again. I could ping 8.8.8.8 all day long with no problem, but browsing in Chrome was impossible. I tried other public DNS servers all with the same result. On a hunch I set the Google DNS servers as exclusions in MWB and boom, I'm browsing like a champ again.
What up with that? MWB never even threw an exclusion popup, it apparently just randomly decided to silently block Google DNS.