I just experienced the same issue. I have some more detail and probably the solution....
In Google Chrome I get "Rate Limit Exceeded. Please try again later." when I access my home page. Or any other Travbuddy related site. Any other website appears flawlessly.
In Internet explorer Travbuddy opens normally.
In Google Chrome in the Incognito Mode it works fine too.
This triggered me to clear the cache of Chrome and after doing that it worked fine again.