I just installed Flash Builder 4.6 today and noticed that some of my 2.4 widgets weren't showing at all in the viewer. Most widgets made the migration across fine, so I narrowed it down to just those that had a chart component. No errors though, the widget just fails to show up (but takes up space in the widget container). If I comment out the mx:chart component, the widget loads fine.
Anyone else seeing a similar issue with the 4.6 sdk?
For now I am using the 4.5.1A sdk in Flash Builder 4.6, and then all the chart widgets work just fine.