[Tilecache] Symbol image transparency problem

[Jez Walters]

Hello TileCachers,

I'm not sure if I posted this question correctly last time, so I'm trying
again!  ;-)

I'm displaying UK Ordnance Survey MasterMap vector maps using OpenLayers,
TileCache and MapServer.  The maps display perfectly when I use just
MapServer ( 
http://osgeo-org.1803224.n2.nabble.com/file/n5389483/MapServer.jpg
MapServer.jpg  ), as well as when I also use OpenLayers.  However, when I
add TileCache to the mix, the various symbol images are no longer
transparent ( 
http://osgeo-org.1803224.n2.nabble.com/file/n5389483/TileCache.jpg
TileCache.jpg  ).

I don't have that much experience of TileCache, so any help/explanation
would be most appreciated!

Jez
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