I am encountering the same problems. Need to book flights from Bangkok to Luang Prabang, then to Krabi and back to Bangkok. Nothing works. Tried three different browsers (safari, chrome, firefox) and not even a simple one-way search goes through. Always the same error messages as the poster above. On Expedia it's the same thing, the reply is that the engine couldn't fight any flights for the routes, which is obviously not the case. Any suggestions?