All meshes appear see-thru in the editor

When I open my project, all the rendering seems to be broken. All my meshes appear to be see through, including the default editor assets and viewports. Everything was working fine the night before and I have not made any changes. The editor Icons seem to be drawing the wrong way as well.

Did you get anywhere with this?
I can’t yet find a solution myself, not how your problem came about!

I assume you’ve tried using a different material already, correct?
Have you messed with any post processing settings?
Is it just this project? If so, and if you really are stuck then perhaps migrate the contents folder to another project.

Solved this. It turns out that its a very bad idea to set the project clipping plane to 0.0

Yes, I solved it see my answer below.