While using the Mounting Bosses, I was unable to locate them in the sketch step using the Smart dimension tool. I could dimension to other lines in the sketch, just not the bosses. Has anyone else had a problem similar to this?
I am able to reproduce the situation you described.
After starting the Smart Dimension, when I pick the Boss circle first to locate its center, it won't pick.
If I first pick a reference, like an edge or sketch and then locate the center of the boss circle, it does pick. This was consistent so I am also able to verify this.
Alternatively, using the Distance Between command lets me pick the boss center first, consistently.