Gideon,
Are we talking Edit>Preferences>Smart Guides & Slices>Angles (such as 30 degrees angles or up to 6 custom angles), and View>Smart Guides ticked?
Clik here to view.

Gideon,
Are we talking Edit>Preferences>Smart Guides & Slices>Angles (such as 30 degrees angles or up to 6 custom angles), and View>Smart Guides ticked?