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See the image below:
Usually these "gaps" between the lines are "helpers" that the editor shows, things that he wants to show but that are not really written in the code.
Check its properties and syntax options Highlight. It may be that in your case these "helpers" are being written with the same background color and so you don’t see them.
Apparently also not that, I put the standard theme of Visual Studio and remains in the same situation.
– danspark
@danspark It may be the setting of codelens (these helpers that come in some verses of VS). Try disabling: https://stackoverflow.com/questions/20457796/how-to-turn-off-codelens-references
– jean
Actually, Codelens was enabled in all languages, but it was disabled in C#, when I deactivated everything went back to normal, maybe it’s a bug because it is the Preview version?
– danspark
@danspark You’ll know... but it seems like you can change the colors of code Lens tb that I would try because when you change the theme changes everything together and it may be that the theme is misconfigured
– jean