Hi Members!
I just want to share my experience... Today I did visa run to Myanmar (Mae Sai - Tachileik) because my Non-B vise expired and on the way out, Thai Immigration Officer asked me about my contract with school. He wanted to see this document. Fortunately I had it with me. I don't understand it - my visa and work permit is valid as long as my contract!
Anyway it is better to have more than less documents ;)