Today I went to Chiang Mai Immigration intending to extend my Non-O visa based on a Thai Wife. I arrived at 08:15 and got queue number C-17. They opened at 08:30. At 09:30, after processing queue number C-10, they announced they were already full for today but we could still have our paperwork checked today, for review at a later date. When my number was called the IO said my paperwork was well prepared but I had used an out of date form STM.2 which I got from their website (the current form is in the photo). The only other issue was that some of our signatures were too low on the paper and we need to sign again higher on the paper. I was told to come back on April 17, after Songkran as my current visa expires on April 28.