I have just migrated my work to a larger PC, Apple MacPro / Bootcamp / Win 10 ARC Desktop - student licence. My data is in two locations, external drive for images / reference data and the calculated data resident in Mydocs ARCGIS gdb. I have copied my ARCGIS folder from my old system to my new system Mydocs and I have succeed in re assigning the external data in Contents and this is being displayed. I can also display contents from my relocated data base. What I cannot do is edit or use the spatial analysis tools on the data. I can select a polyline from Contents for editing but the editor will not select the line on the screen, but the editor can draw a new line using the same feature. ; the 3D analyst is greyed out and unresponsive eventhough I have elevation rasters in Contents and I can see these; I cannot split polylines ... I have missed something really obvious..... suggestions welcome please.