I hope I am not teaching people how to suck eggs and I am sure this issue has been raised before, but thought I'd relay my experience this morning at Promanada in Chiang Mai. I recently renewed my passport at the Australia embassy in BKK. The visa was still in the old passport. If you are not aware the cut half the front page off the front of the old passport and stamp the front page in which you enter the number of your new passport. It is also electronically 'retired' at this point. come to renewing visa, I was not aware that you have to transfer your existing visa to your new passport prior to renewing your visa. This is done at entrance 3 (Promanada) must have your old passport and your TM6 entry card. You can do this anytime once you have received your new passport, but as I was not aware of this procedure I did both on the same day. I was still out by 10:00 AM.
As always I found the staff at Promanada exceptionally helpful, I know a few people have had issues but following these three simple rules may help 1. It will take as long as it takes, deal with it 2. Dress appropriately, it is a government office after all 3. Have a good attitude, they are only trying to do thier jobs. I hope this is off some use.