I came back into Thailand from the UK with a new passport only to find I could not accompany my gf to Vientiane until my old passport stamps were transferred into the new passport, even I presented the old passport as well. There are many ways to catch a cold in the land of Smiles.
my fiancee has already applied for a new CENOMAR. I have a certified copy of my Divorce from the UK which is now almost 18 months old already. I tend to research the requirements and do the legwork myself instead of using an agent.