Also, can you include your full task definition? There are a lot of options there which could cause it to launch in a different working directory (which will mess with your relative paths) or as a different user (which could mess with whether you can import your libraries).

I think it's possible to export the task definition as XML. Copy/pasting that here will be fine (not as an attachment, please, we just need to read it).

It's also difficult to collect standard output, so you may want to try adding something like "sys.stdout = sys.stderr = open(r'C:\Users\Public\Public Documents\log.txt', 'w')" to try and collect any output that you may be missing. The full path to the file is important, and it will need to be somewhere that most accounts can write.