Check the processing extents. Sometimes, for some unknown reason, the processing extents can be changed. When this happens the results from any raster processing can be clipped to the limits of the processing extents. If that happens, you only see part of the results or no results. A telltale sign is getting no results or results that have vertical and/or horizontal limits. Puzzled me for a long time.
Go to the "Geoprocessing" menu> "Environments..." > "Processing Extent". Under Processing Extent choose a layer that you know covers the full extent of the waters you are processing and click OK.