asp.net - Design view in aspx doesnt load

Question

If I click "Design" the code still shows (but is not selectable). If I minimize and maximize it shows the below instead of the designer.

I have tried repairing VS2015 and safe mode, still doesn't work. I also tried setting the default "Open With" program, but nothing changed no matter what I set.

HTML files have the same problem. I have tried rebooting as well. Running Windows 10

Nothing has been changed recently.

What is causing this?

Answer 1

If anybody gets here via google, as I did myself when I encountered this behavior:

I was able to solve the error by installing Visual Studio 2015 Update 2 (Version 14.0.25123.00) from the installation DVDs .iso-image. You can check the version you're running by navigating to HELP > About Microsoft Visual Studio

After doing so, i was able to access the designer.