I got that every time I tried for the last 4 years since I changed passports, today it actually got through to accepting the submission and to the 'Pending' stage.
because with zero expectation, I went ahead and tried it (you may recall I have not managed to get past the first page since I changed my passport 4 years ago). Well imagine my shock when I got all the way through to pending and printing it out!
My understanding is that BKK bank can 'update' the book without an actual transaction, as a friend does this. I use Krung Sri and just make a small deposit within 24 hrs of going to Immigration. I have never had a problem with this but I am not using Chiang Mai immigration either.
Sorry Tod, I should have been a little clearer, he is traveling on a British passport. Anyway, you answered my question above, with the repost that James kindly provided. Thanks again guys.