I have taken many short trips around Thailand over the last few years and never had an issue regarding TM.30 when doing 90 days or the extension. (BKK)

That being said though, as with everything in Thailand, your mileage may vary

@DeShay *****

you've never been given a blue slip with your passport?

@Bob ********

If I recall correctly, he went in person for the extensions and didn't do e-extension.

Had a message from a friend earlier who is going home after just shy of 7 months (1 TR + Extension and 2 visa exemptions + 2 extensions). Apparently when the original IO scanned his passport they took him to a supervisor, the supervisor just scanned the passport again, stamped it and sent him on his way. When he asked what was wrong the supervisor just smiled and said sabay sabay (Left via DMK)

Sounds like this could be the most logical reason as to why

@Marc *******

you'll get a blue slip, that is your receipt

It will be announced like every other time a note/coin that has been removed from circulation. They will slowly remove old notes until there is only so many in circulation and then announce that you have until X date to exchange/use the old note/coin.

Non-O visa then Non-O extension to 1 year and getting a multiple re-entry permit is probably your best bet. If you time it right you'll be able to do it on your next entry.

@Paul ************

yes, but it's shocking how many people don't realise until they get to the check-in counter at the airport, so it's worth mentioning every time

The UK embassy doesn't care from my experience, I can't speak for the rest though. However your biggest problem will likely be with the airline as most will ask to see an onwards/return flight when checking-in