Yes,
that did it.
Vlad told me 2 days ago.
I think the wording on that could also be "Execute on client only". that may be confusing to some ppl though. In the user guide, it says that rules are evaluated when the form is submitted - so thats why my defaults were getting set back.
Vlad wrote this:
"Ticking this box makes sure that the rule is ONLY executed on the client and not on the server."
thx