I know nobody know anything about that format, but there's a very curious issue with them. Anyway, check out: http://maps.dnr.state.mn.us/cgi-bin/mapserv43?map=/usr/local/www/docs/testing/multiple/test.map&layer1=landsat&layer2=shr30im3 Notice anything wierd with the bottom image? ;-) Used to work fine in 3.6. Any ideas? Steve