I don't know, I did that 60 day extension right after my first entry and no one told me that the visa would be cancelled. I already entered Thailand last night and got a new stamp for another 90 days.
At which immigration office did they tell you that?
I have a multi entry Non-O visa, every 90 days I leave the country and come back. Does this mean that every time I re-enter the country I can use the IDP?
I mean, does the ability to use the IDP reset for 90 days every time you enter Thailand?