I've arrived last week in Thailand and entered with a visa exempt. Two days later, I have received the confirmation and approval for my DTV visa, which was under processing prior to that. I've mentioned this situation to the IM officers at the airport, and they said it's no problem, I just need to wait for the confirmation, and once it's done have the stamp exchanged at the local IM office. I went to Huahin office and see if I can have the stamp changed, but they said I have to leave and re-enter the country. Please let me know your input on this. Thanks!