Problem
Unable to select some of the model elements when comparing the models
Cause
If you select New and Removed view options at the same time, some model elements might not be visible for selection. Also, the property panel might show a different model element's details. This happens due to overlapping of the model elements, and could occur when a model element from the previous version was deleted, then replaced in the new version with another element at the same location.
Solution
Select either New or Removed view option to avoid the overlapping.