The Yahoo search example supplied with XMP-FileInfo-SDK-5.1 works perfectly well when PanelTest.mxml is compiled from Flashbuilder 4. However when I add the panel to Photoshop CS5 the http request fails. IT have indicated that the request doesn't even get as far as the firewall. The installation of Photoshop is at the root level, so the info panels are at Mac HD/Library/Application Support/Adobe/XMP/Custom File Info Panels/3.0/panels, not /Users/<username>/etc.
cfg files are in place and flash security settings are correct for that location.