<layer> <name>Census Block Points</name> ... <symbol> <simplemarkersymbol color="0x0099ff" size="40" style="triangle"/> </symbol> </layer>
Trent,
I have moved this thread to the proper forum "ArcGIS Viewer for Flex" vs. "ArcGIS API for Flex" where you had it.
You will see in the documentation that you need to have the symbol element as a child to a layer element, if you are trying to symbolize that one layer specifically. If you are trying to set the default symbology for all layers than the symbol element has to be the child of a symbols element.
http://resources.arcgis.com/en/help/flex-viewer/concepts/01m3/01m300000023000000.htm<layer> <name>Census Block Points</name> ... <symbol> <simplemarkersymbol color="0x0099ff" size="40" style="triangle"/> </symbol> </layer>
<layer> <name>Census Block Points</name> ... <symbol> <simplemarkersymbol color="0x0099ff" size="40" style="triangle"/> </symbol> </layer>