Steps to reproduce:
- Source > Repo > Reports.
- Choose Line as Chart Type.
- Choose a "Date Range" (i.e 2012-04-01 - 2012-04-30).
- Hit "Apply".
That will generate a graph but the Pie and Change options are disabled (and the Date Range information entered is removed).
All filters also fail to modify graph data.
Workaround: Hack the URL directly: