I have used the workflow built into the toolbar to generate flow direction, accumulation, stream, stream link, catchment grid, drainage line and catchment polygons. I saved all the files on the server for my college to continue on to define batch points and subcatchment delineations. She added all the layers to a new blank map and was able to delineate watersheds with the point delineation tools. However, when she tries to use the flow path tracing tool, nothing shows. Same thing with the interactive flow path tracing tool. Anyone has encountered this problem before and how to fix it? Many thanks.