Over the past few weeks I have been experiencing a problem with my geoprocessing tools. This problem forces me to kill ArcMap, end tasks, and restart ArcMap hoping it won't happen again.
What is happening is that a tool (ie. Append) will run to add an ocean polygon feature class to a waterbodies feature class with "No-Test". The results window says Succeeded at Fri Nov 222 09:23:53 2013 (Elapsed Time 0.56 seconds). However, the background process is still running and the results are never provided.
I make maps, crunch data, and work a lot in ArcGIS. Lately I have become good at killing it because the tools hang. What types of solutions do you have aside from re-installing ArcMap 10.2. Maybe a python re-install?