Is the drop shadow on your DataList on the main application state (first page/state you see when running your application)?
Does the drop shadow appear when you run your project in the browser?
If you could give me some more specifics I'd really appreciate it!
I have the same problem. I have few states on scene in flash builder and for example on second state I have s:Panel. I can't remove dropShadow from it. dropShadowVisible="false" doesn't work. How can I change that?