I am trying to use the Contour List tool to derive specific contours from a Mosaic Dataset in a File Geodatabase, but it doesn't seem to work. It starts and runs indefinitely. It creates an empty (or on one occasion partly populated) feature class in my Geodatabase. I have read the online help for this tool, but it doesn't seem to spell out limitations concisely. Does it not work on a Mosaic Dataset? Does it not work with rasters or features in a File Geodatabase? When I run it in the Python window (on the Mosaic Dataset or on a single FGDBR raster) it tells me that the rasters do not exist.