Could you post a picture of what you're talking about?
I get this from time to time and the only thing I do is to delete the detail view and then add it back. It's like there's a timing issue with model items and being able to move them. I'm guessing that your model items are in the right orientation and are on the right view as you've said above. That's the first thing I notice when trouble shooting...
This has been happening to me on a number of releases now. The only way I found is just hide the model dim. in the parent view and add in the dim manually (driven). Always happens on chamfers and radii, inconsistently on some dimensions. drives me batty!