I have been having trouble with opening assemblies and the parts not loading.  SolidWorks is finding the part, but it remains unloaded and doesn't appear in the assembly (see picture below).   When the assembly opens parts are missing and the tree shows the part is found, but it doesn't have the expansion box.   To get the parts to show, I have to suppress these individual parts and then unsuppress them and everything works.  We are loading the parts off our network and going through a couple switches in the path.

Any thoughts?

Thanks for any help.  This is aggravating!