hallo.. i also encountered the same problem for almost 3 days..it seems that smartbro is having problem especially on their DNS servers..i tried using the ones on the opendns.org website and i was able to open different websites again without any problems. try setting your DNS server address to static using these:
208.67.222.222 - preferred dns
208.67.220.220 - alternate dns
this solved my browsing problem,it might also help you guys..there are also other DNS servers on the internet that you could try to use like:
4.2.2.1
4.2.2.2
202.57.96.2
202.57.96.3
tried them both and it worked..again,its just a matter of trial and error.
hope this helps!