Drawings missing data in Viewer

We are using SolidWorks 2008 SP4.0. When we open a drawing inSolidWorks that has a part in it, the type of material is listed inthe properties of the drawing. In this example plastic is in thematerial properties box. The problem is when our users open thesame file with SolidWorks 2008 SP4.0 Viewer or Edrawings thatinformation disapears.

There was some speculation that there could be some cached metadatathat is not getting updated when changes are made to the part. Ihave used the rebuild command on the part and the drawing, but Istill have this issue with missing data.

Is there more to the rebuild process?
Why would the drawing file be different when it is opened with thefull version of SolidWorks than when it is opened with theViewer?SolidworksDrawings And Detailing