I am divorced and have 2 Thai children, i have never had a problem getting a 90 day None O visa, i went to my local immigration office to ask how i extend my None O visa for dependant children. They gave me a list of what i needed to show them, went back with what they required, 7 times, 9 in total. They just kept asking for more things that where not on their original list. Also my children had to take time off school to attend. Finally the owner where i stay had to step in and visit immigration, next day visa application accepted, she must be a powerful person or know one.
So you do it correctly and you have many problems, my last visa i did a boarder run and was granted 60 days visa waiver without any problem, i have brought tens of millions of THB to the Thai economy, no more, time to sell up and move to a more visa friendly country, or maybe just play their games and get around local immigration! I think, selling up and take my money out of this country is the best option next year!!!