I recently updated my Visual Studio 2017 from 15.4.2 to 15.4.5.
At some point during the day I realized that in debug mode I could no longer view objects while stepping through code. I brought up VS 2015 and that environment still works.
Some things I found online suggested setting certain values in the debug options menu on the visual studtio environment, but that did not help either.
The Image shows there is no expand arrow to view the SomeObject item.
(visual studio 2017 bug)
This image shows my same machine with Visual Studio 2015 and the expected behavior. Until recently 2017 had this behavior.
(visual studio 2015 expected behavior)