Hello!

They've just released 4.0.3-stable. They say it contains lots of improvements. But for some reason in my project render to texture's stopped working there. All I see is toxic pink color. I tried re-creating the material - no effect, still just toxic pink.

When I roll back to 4.0.2-stable it works no problem.

Is it not working just for me in 4.0.3-stable?

Are you using viewport texture or shadder ?
One thing that I notice is that it only works if you use the override material.

If it's a viewport, you might also have to set it to render always cause by default it might only update once.