In 21.4.11 the standard setting does not allow to open library nodes and also shaders.
This can be confusing, especially for beginners, who explore helppatches like HowTo Write a custom ShaderFX Node or HowTo Write a shader:
Those patches should at least contain a hint in the description where to change the setting.
Please either use the short 4.11 or full 2021.4.11 as the version description. if there is now a third way or writing versions, it is going to be difficult for newcomers to understand what you mean.
Imho if there is a new setting, it should be disabled by default.
Maybe vvvv should come with a “what’s new in this version” window or a (first) start patch like it was in beta.
@motzi Definitely an oversight on our part. It should of course be possible to open the shader. We will report back once this is functional again.