Why does code rendering disappear in Visual Studio 2015?

Question

visual studio

Have a nice day, everyone!
I ask you to help me solve the problem with the studio. The problem is the following - the visualization disappears when switching from the aspx code tab to the aspx.cs code tab and sometimes to js.
It looks like this just switched
Move the cursor over the code and the partial manifestation
panel Scroll the page the code appeared, but there are problems with the navigation panel
Minimize all windows (win + d) and open the studio everything is in order
Click again on aspx and again go to cs - again everything disappears.
What's the bug?
I installed the 2017 studio - the same thing, I thought that it was the case in the studio, demolished it and installed the 15th one - again the same thing ... I tried to reset the settings, deleted all available extensions, rolled up the updates ...