The issue still persists in Blender 2.81a :(

+1 here. I start rendering (whether in Eevee or Cycles), the render window opens and stays grey (checkered). But instead of rendering, the RAM claim of Blender runs bigger and bigger until finally it crashes. Interestingly, the scene doesn't even have textures in it. BUT this only happens with scenes which I started in RC1 or RC2. Older scenes seem to render fine.

Okay, I can provide a .blend file soon – as soon as I met my project deadline ;) I’ll get back to you!

Okay, it doesn’t crash with a fresh scene. But oddly, I only have some strokes and a background movie in the scene, nothing else. I re-used the scene setup from another scene in that I duplicated it and started editing the duplicates. Does this make any difference?