just for the record: we managed to get one of the apps (python.exe, requiring python24.dll) to work: on some machines msvcr71.dll was needed on top of the python dll - unfortunately the error message doesn't go to stderr.
Just on this point, I've had cases where stderr is empty but I've recieved an error message from Condor via email. Might be worth checking that e-mail from the condor job isn't being blocked/dropped at the mail hub. -ian.