Hi Simon,

One thing that sometimes happens to me is that not all image formats are 
loaded. Method javax.imageio.ImageIO.scanForPlugins() achieves that, I call it 
for testing while GeoServer is stopped at a breakpoint. In some cases I have 
been able to fix the issue by installing JAI and ImageIO again into the JDK. 
Where the ImageReaders are queried depends on the store's format, for 
ImagerMosaic it happens in the call to 
javax.imageio.ImageIO.getImageReaders(Object) within 
org.geotools.gce.imagemosaic.catalogbuilder.CatalogBuilder.CatalogBuilderDirectoryWalker.handleFile(File,
 int, Collection).

Felix
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