Why does double click no longer work to edit exploded view in 2015


I recently upgraded to 2015 SP4.0.  I'm trying to edit an exploded view with a lot of steps (103 to be exact).  I used to be able to double click on any component in an existing step, and little blue arrows would show up reflecting each step the component was a part of.  You could then drag the arrow to adjust the explosion.  In 2015, double clicking does nothing.  I've tried in several assemblies with the same results.  Trying to find the correct step to edit is very time consuming, as you can imagine.  Is this normal functionality, or is my system broken?  Is there another workflow that replaces this?  Or did SW just take functionality away?  Thanks in advance for any help.

Mark

SolidworksAssemblies