For some reason, I can't get Buffer_analysis to run successfully from PyScripter(126.96.36.199) for a particular shapefile. It fails to complete and exits with error 999999. I can run the exact same command and data in ArcMap(10.1 SP1) and it completes with no errors.
Can somebody suggest a reason why this may happen and possibly a solution? I have noticed this with other commands as well. It runs fine in ArcMap, but has problems in PyScripter.