Errors for me using SFV 3.0 Source and API 3.0 Beta 1
IDE:Flash Builder 4.5
SDK: 4.5.1a
1.)
Error importing the following:
import com.esri.ags.tasks.supportClasses.ProjectParameters; found in TocLayerMenu.mxml, GeoprocessingWidget.mxml, DrawWidget.mxml, and EditWidget.mxml
Checked in the API referenced .swc (agslib-3.0b1-2011-12-16.swc), there is no ProjectParameters in supportClasses.
2.)
MapManager.mxml line 624
dynLayer.gdbVersion = gdbVersion;
: Access of possibly undefined property gdbVersion through a reference with static type com.esri.ags.layers:ArcGISDynamicMapServiceLayer.