TileIndex & Raster Images Problem

[C Gould]

Folks,
I have several layers using TileIndexes which link to georeferenced tif
images. The layers show happily (when in zoom range) when one of the
images is displayed on the map image being requested but mapserver fails
with the following error message if there is no tile being displayed on
the reqeusted map image:

msDrawMap(): Image handling error. Failed to draw layer named 'Blah'

I'm probably doing something quite stupid, but can anyone suggest what?
Ta
C

Craig Gould 

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