Retently I found it is not very esay to view my model in a ghosted preview mode ,specifically when there are a lot of masses .Then I thought maybe you could add a Shaded preview mode for GH?
Are you using 32 or 64 bit Rhino 5? I cant get the 64 bit version to load the latest grasshopper plug in. Maybe there is a trick? besides installing 32 bit that is..