Class Visibility issues with lighting instruments

[daviderees]

I am having issues with class visibilities with my current document. It is imported from a .dwg document. The lighitng instruments that I converted were divided into classes by type. I have been very careful to keep everything in the correct class. When I try to make quick global changes to a type of lighting instrument by changing class visibilities to "gray others". The active class grays as well and I cannot "select all". Any thoughts? (I am aware that I can use the "find and modify" function to select the lights that I want, however the visibility function would be useful for other things as well.)