When editing a part file, I can usually single click a feature on the model and the relevant dimensions pop up.  I get the same affect when selecting features in the tree.However, on some files files this does not work, I need to drill down to the relevant sketch in the feature tree before the dimensions popup.

And to be more confusing, I have co-workers who get no action on a single click, they need to to double click to see the relevant dimensions.

I'm sure it is some setting.. Anyone see this?