I gave an assembly to a coworker and he made some drawings and gave it back. Now almost all of the view toggles are greyed out. I really needed to mate to an axis, but I was unable to turn on the view of axes. What causes this greying out?
Ah hah, thank you! Going to view and deselecting hide all types did it. I figured it would be something simple. Seems like "Hide All Types" would be a good addition to the on-screen hide/show items menu.
It should also appear in the "heads up" view tool bar as a pair of glasses with a drop down menu arrow next to it. From there you can select what you want to show/hide.