Trying to load a couple of files made in the Spring 2018 version (2018.1.3) getting this sort of error:
[ResourceShader] pbr-metal-rough-with-alpha-blending:49 | 2(49) : error C1008: undefined variable "pbrComputeBRDF"
[ResourceShader] Last known valid shader is currently used. Please fix the project shader.
EDIT: Had to change the shader to the same type, text when I opened up the shader panel said "(outdated)", reselected and it updated to current version. Error no longer appeared on load.