Prehaps more fallout after the bombing suspect fled to Cambodia.
http://www.thai visa/forum/topic/855 ... te-effect/Breaking News! Every Thai-Cambodian border check point and Kanchanaburi border check point will not stamp, for the time being, 15 or 30 day visa waiver stamp, effective 12th September 2015 onwards. People with valid Multiple Entry Thai Visa have no problem, it is OK to activate your second or third entry of a Tourist Visa or a valid Multiple Entry Non Immigrant Visa.
This is from ThaiVisaService.
So Thailand is saying;
Get a visa or don't come by land