OK, this seems to be the problem we found, in sketch, we can dimension to datums until we add an angular dimension, once we add an angular dimension, we can not pick any datums when dimensioning in the sketch. We proved it by removing the angular dimensions then added the required dimensions...
if you look at the pic I attached, you can see that I did have "No Selection Filter" for the other filter, and I use EDIT with Rollback as the default for my sketch editing, so any datums created after would not even appear.
I had to create a line, constrain it to the datum, then dimension to...