I am using SW 2015 and I am seeing something similar. It is interesting that, in a sketch, both the box selection and the lasso selection show the green and blue like you said, but (for example) when I am in a combine, the lasso selection works correctly, but not the box selection.
See the attached video. Notice that the box selection when I am in combine does not show as expected, but Lasso does.
I am going to report this to my VAR so she can look at it. Maybe you should do the same.
Box Selection.mp4 2.1 MB
Reported to her and she came back with this:
Sounds like it might be the case, although it doesn't explain why Lasso Selection and Box Selection look different.
I have verified that the green color (cross selection) of lasso selection does NOT select bodies that intersect it during the Combine command. So it is misleading at the least.