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I would like to do this too... I can't find any reference to rebuilding thumbs or medium sized images on this site. The default thumb size is 50 and medium is 400. If you change to larger later then neither is regerated at the larger size. You still get images but they are just stretched. If you delete the files they are not regenerated.
Is this a coppermine problem or a xcgallery problem? How hard was integration of coppermine? Is anyone working on porting the newer versions (1.3.2)?