Cannot View Dashboard Graphs

Cannot View Dashboard Graphs

Hello,
 
Some of our users can no longer see the graphs on the dashboard page.  Each graph block indicates that the data is not available.  There is one person that can see the graphs only when they click on the magnifying glass in the bottom right hand corner and it pops up in a separate window.  I can see everything on the page just fine.  With regards to the dashboard, everyone has the same level of permission.  We tried deleting our Internet cache as well as our temp files and it has not fixed the problem.  We are using Internet Explorer 8 and are not able to change our browser.  Please advise.
 
Nbeck