Viewer 3.3 get frozen

Hi,

I'm using Flex-Viewer 3.3 pointing to an ArcGIS server 10.0 sp5 (database based on arcsde 10 and postgresql 8.4).
There is a mapservice with a layer of polygons related to a table.
When the info popup window shows up, sometimes it gets frozen and cpu goes to 100%. I noticed that if "f=json" all works properly, if "f=amf" the widget gets stuck (f.i. http://localhost/arcgis/rest/service...mf&objectIds=6 )

Do you have any suggestion?
Giuseppe

Edited: After a while I get this error

Error: Error #1502: A script has executed for longer than the default timeout period of 15 seconds.
at com.esri.ags.components.supportClasses::DoubleField/format()
at com.esri.ags.components.supportClasses::DoubleField/set data()
at com.esri.ags.components.supportClasses::DoubleField()
at com.esri.ags.components::AttributeInspector/createFormItemComponent()
at com.esri.ags.components.supportClasses::FormField/getRendererInstance()
at com.esri.ags.skins.supportClasses::AttributeInspectorRenderer/commitProperties()
at mx.core::UIComponent/validateProperties()
at spark.components::Group/validateProperties()
at mx.managers::LayoutManager/validateProperties()
at mx.managers::LayoutManager/doPhasedInstantiation()
at mx.managers::LayoutManager/doPhasedInstantiationCallback()