Corrupted scene? Blurred meshes, sprites "squeezed", etc

Hi guys,
this morning I opened my project and something weird happened which will actually be described better by this screenshot:

  • All my meshes have some kind of translucency and blur
  • Lights seem not to be working anymore and the sprites are “flattened”
  • If I click on a mesh in the outliner you can see that in the viewport, it disappears if unselected.

I’d really like to solve this since I was using this as a kind of showcase scene, very handy for my work.

Thanks a lot!

**** Sorry guys but this was due to setting “Near Clip Plane to 0”. I put it back to 10 and it’s now correctly working*****