Hi Thys,
unfortunately I can't break your example here (using 5.38) except for one case:
If I don't "tab off" the date, but just click "next" then in some cases the "next" button request completes before the "date of birth accepted event" completes. Which hence causes some confusion. If I "tab off" the date field, then click next, it works flawlessly.
Can you confirm this is the same for you - or do you get an error in other circumstances?
cheers
Bruce