As you can see above in the picture I am trying to ship my product to the US and other countries too but it won't allow me to proceed with the checkout.
Its working only if I set up my own flat rate shipping but not working for carrier rates.
It worked before as many people placed their orders from US but all of a sudden it stopped working and only working for shipping in Canada.
Please help us guys ASAP as we are losing a lot of sales because of this problem.
I hope you would have solved the issue by now. If not, can you confirm the following for further detail about your setup?
If so, these might be creating the issues with "Shipping not available".