FWIW - I found a UK FA post back in July 2014 that said "None of the FlavourArt flavourings on the FlavourArt UK website use Diacetyl, Acetoin, or Acetyl Propionyl." I didn't look back further, but I believe FA was at the forefront of avoiding DA/AP. The comment in July 2015 from UK FA seemed to refer to the need to steep (citrus fade and custard come through) rather than a recent reformulation.
As I said earlier in the post, I do not know when it happened, but it is a fact that FA reformulated their custard recipe. The original had DA/AP, the version now has BA instead. The UK vendor even states that the recipe was 'reformulated to omit diacetyl' in that very post you are referencing. So, it could very well be the case that they changed the recipe in 2013, but that is irrelevant to me as I had never tried the original version, just the version with BA, which to me smells/tastes like off cream/vomit - which was the reason for the thread...
So, all this probably just means that Dixie1954 is not sensitive to BA, rather than having the DA rich version of the Custard.
The issue still remains the same for me - I smell off cream/vomit notes in FA's Custard.
@WhiteHighlights do you use FA's Custard? Do you smell what I smell? Does it fade with extended steeping?