Hi everyone,
Beginning with macOS Sierra (and now in High Sierra), I am unable to COPY files between two locations WITHIN a connected network share if Avast is enabled (NOTE: I can copy TO or FROM the share). When I try to copy a file, I get a ‘file in use’ error (and it’s with ANY file I try to copy). If I disable Avast, the issue disappears. I tried adding the network share to the ‘Excluded Paths’ list but that didn’t work.
I did not have this issue when El Capitan was installed.
HELP!
Thank you,
JM
Hello,
what network share do you have a problem with? Samba? NFS? And which version of Avast do you have installed?
Ondrej
Hi Ondrej,
The share is on a Windows 2012 Server. This server has Acronis Access Connect installed which allows us to connect to the share via AFP (Apple File Protocol).
We are using Avast 12.9.
Thank you,
Jon 
Hi Jon,
both samba and afp share to other Mac computer as well as afp share to win10 hosted Acronis Files Connect trial app work fine for me on 10.12 machine; copying via cp as well as Finder works fine within the volume. I have no idea how to reproduce this issue.
Ondrej