SUITE stage_only attempt error 8007007b

I have a problem where a suite package fails to unpackage any packages.

This has occurred with some customer's systems, and with a system in Custom service (tech support). It does not occur on all systems.

I have tried replicating the problem on my system, but all attempts are successful. I have compared logs from a successful process and one that fails, but there is nothing to indicate what the problem can be other than the line:
Stage parcel status: 8007007b

On a successful attempt the status value is 0.

We have tried downloading the files again, and the package size looks good. We have tried moving the 'setup.exe' file from the downloads directory to a new directory off of the system drive.
Our command line typically looks like this

"C:\<filePath>\setup.exe" /stage_only ISRootPath="C:\<filePath\StageFiles" /debuglog

This command line will work for me but not for one of the tech support people and on some customer's systems.
Here is a sample of the log file for the relevant bits:
I did note that error 8007007B can relate to not being able to find the filename, path or volume label.
https://support.microsoft.com/kb/929826?wa=wsignin1.0