I recently updated to Xcode 7.3 , however while debugging at break points , the objects show in the debug area but clicking the triangle to reveal the variables does nothing
If you're hesitant to change Build Settings, you can pull up additional information by casting the variable with its own class, though (frustratingly) you have to do it per variable. This works even for self.
For a class MyClass, right-click/control-click in the debugging variable list and choose "Add Expression". Add in the name of the class, plus the name of the variable:
(MyClass *)self or (MySubClass *)subclassVariableName.