ExplicitHistory command/Grasshopper on RhinoWIP for Mac not working.

Hello, I am new to Rhino and Grasshopper, I downloaded the 90 day trial of RhinoWIP for Mac the other day. 

When I try and use the ExplicitHistory command however the below screen appears. 

Then when I try to add any components the window turns black and the components red!

I have updated my Mac and uninstalled then reinstalled Rhino.

Has anyone else experienced this?

If anyone has any advice on how to fix it that would be much appreciated!

Thanks!