I noticed if I had an Append to Variable action under an ADO Dataset Iterator that some of the lines I was appending to the var were being missed... The values were valid and I could watch the append happening "sucessfully", but the values were'nt being appended.
After a bit of investigation it seems the I was appending had emedded variables (which is fine), the append didn't seem to work correctly when that embedded variable value had a % sign in it, it just skipped if entirely - pretty sure thats a bug...
TJ