While at the Home / Reports / Resource Graphs / Choose menu selected more than:
56 things with firefox 22.214.171.124 for linux(FC6) the resulting page is generated very quickly and is completely blank page and empy page source.
37 things under IE 6.0.2800.1106 fails to even load the next page and gives and error in the status bar (bottom left)
I was testing on the most current 1.3.9 from the yum repo on centos 5 also patches to current. Apologies if this bug has already been entered I did not find anything related with a cursory search.