I'm attempting to make an elevation profile from a DEM in ArcMap using the Interpolate Line tool. I've done this before, and it has worked great--basically I just draw a line with Interpolate Line, then click Profile Graph to get the elevation profile. However, for some reason, it's not working now: when I draw out my line, nothing shows up on the map. I don't get a line, and I can't figure out what I'm doing wrong. I've searched online for an answer, but to no avail.