Here are the details: Windows 2012 F-Secure version 14.55.111 Run FSAV.exe from .NET process Turns out we had a threading issue, whereby the files in the folder were removed half way through the scan. I'm guessin the FSAV process enumerates the files in the folder first; and then iterates over the list. We had a densely populated folder so this took a while. Another process inadvertantly removed some of the files. Thanks anyways.
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