Do I need to do something new with additive blending in 5.4f3 or is there currently a bug there?
I had a nice additive blend shader working in 5.3.4f1:
In 5.4f3 it shows in the scene window fine but when I run it the result is way too washed out. When I move, it has a weird motion blur effect happening. This screenshot is from a Windows build but on a Mac build it turns magenta in random places as I move around.