General Question to a Newbie on the Block

Hi Everyone,

I am a student taking a Solidwork course at a community college. Our instructor has arranged for us to obtain a student version of Solidworks that we can use at home. We are now working with assemblies (building a lego truck) ,what does it mean when you are rotating your assembly and you end up with grey boxes when you are in process of rotating?

Is this a normal function for home computers or do I maybe have something installed wrong?

I hope that I have posted this message in the right spot and if not I do apologize.

Thanks,

George

SolidworksAssemblies