Reply To: Bevel modifier issue.
Interestingly enough , If I add a new gear , and duplicate it , and add bevel modifiers, you can see them both working fine : 
BUT , if I go into edit mode on the green one , and add a single loopcut close to the edge as shown in orange, it sharpens up the bevels on the whole gear…… And moving the loopcut closer to the edge removes the bevels all together on the whole gear :
So I am going to assume from this experiment , that the bevel modifier bevels all of the geometry to the biggest size it can go , and if certain geometry limits it from doing so , then it shrinks the bevels on the whole object relative to that size? I’m guessing this is in some way linked to the issue I am having with bevel mods not appearing to work at all on certain objects?