Nope - the problem is repeatable even after reboot. Our files are checksum checked daily and downloaded from our host if there's a mismatch.

We fight AV issues regularly, and have identified failure signatures that point to system security interfering with our tools.

We also test for Home edition and deprecated platforms and terminate, with detailed logging.

I can cause this by running with a different (newer) version of Kix, too. Small scripts seem to be backward compatible, but many of ours exceed 10K lines with dozens of UDFs. I absolutely can not run our scripts tokenized on 4.66 on 4.67 without strange errors.
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Actually I am a Rocket Scientist! \:D