I've got a report that has a From Date and a To Date.
From Date is set up to be today -7, and To Date is set up to be today. So far, so easy :)
When the report first loads, either in dashboard or expanded view, I get an error - Invalid Filter Data. If I am in expanded view and simply click the little arrow button to re-run the report (without changing the values at all), the report runs fine.
Doing a show filters in the dashboard on that particular report says 'no filters', until I resolve the issue in expanded view, then it does show filters. I'm guessing this is at the core of the issue.
I think this might be best to handle in a support ticket. I'll be in touch with you shortly.