Making material transparent working in IDE, but not in built game (Standard shader missing in built game?)

I use the "Standard" shader to make a player transparent when it gets killed. It works fine when running the game in the IDE, but when executing the generated Windows .exe file, the player never goes transparent.

When looking at the list of shaders in the Project Settings > Graphics, the "Standard" shader is not there. If I add it, the built hangs at the step "Building assets - sharedassets0.assets"

Is it Ok that "Standard" shader is not listed in the shaders list? If "yes", what am I missing for the transparency code to work in the built game? If I have to add it to the list of shaders, why does the build hang?

I'm using the latest Personal version 5.5.1f1

Thanks!