Having installed both ArcGIS 10.4 and ArcGIS Pro 1.4.1, I have a suite of Python Tools installed (see screenshot). I know I successfully used the "Python Command Prompt" in the past and found it quite useful. For some reason, now when I go to open that tool, my screen flashes and the window disappears (or fails to launch correctly?). Does anyone have any suggestions for what happened or (more importantly) how I might get that working again?
