Have you tried remapping to the folder in Quick Fields? I have run across this once before on a customer's LF server, while they said nothing had changed, once I re-mapped to the folder it worked fine. 

Are you using QF Agent with the session? If so, can you make sure that the account that the QF Agent is using has full rights to the path?

If it's not rights to the path, please make sure that other applications are not restricting access to the path.  In cases we've had at Support, this usually means that the antivirus application is restricting access. 

Yeah, that's the thing. Nothing has changed and all the other sessions are working just fine. So for antivirus to just affect that one session is odd and the network security permissions have not changed on the folder where the files are stored and quick fields gets them from, nor has the security changed in our public repository for any users and especially not for the user profile that is configured in quick fields. It is an admin profile. It is very strange. I guess I will wait to see if remapping all the folders will fix it and if not... I guess I will just rebuild the session to a new QF session and hope that fixes it.

Antivirus applications get updated all the time and have been known to cause this type of selective behavior.  You should check and make sure that all the LF files, folders, processes and executables are exceptions in it.  If it is not the antivirus, the behavior suggests it is something temporary like another application.  We typically ask end users to run a Microsoft Tool called Process Monitor and run it when you experience this behavior.  https://technet.microsoft.com/en-us/library/bb896645.aspx.  It will show you what else is using that path besides QF.

Dears,

I am facing the same issue at a client side using QF agent.

Laserfiche capture engine is used as scan source, with no antivirus installed on the machine.

And set explicit rights for the windows account used by the Laserfiche Quick Fields agent service as logon to the “'C:\ProgramData\Laserfiche\Quick Fields\Files” folder, allowing full control on it and its subfolders and files.

And the error persist. I will remap the Retrieved / Moved folders an will let you know the result.

Attached is the error screenshot.

Did you find out what was causing this or did you resolve it by rebuilding the session?