EM Database Control "Performance" item doesn't work properly on my Internet Explorer 8

Hi,

I have a problem:
I have upgraded my Database Server (also my EM) from 11.1.0.6. to 11.1.0.7 and my Internet Explorer from 7 to 8.
Now when I  run Enterprise Manager Database Control from IE 8 on my server (MS Windows 2003 Server Enterprise X64 Edition SP2) , the "Performance" item doesn't work properly: in the Baseline Name "SYSTEM_MOVING_WINDOW " section - only two "Loading..." messages appear instead of the two diagrams. When I run Enterprise Manager Database Control from IE 7 on my PC (target=the same database, of course) it works properly, the diagrams appear OK, so I think that IE 8 is the problem. I think I have a wrong setting on my server, but I don't know which ...