File locks working strangely with PADS CAD files stored on TrueNAS SMB shares

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I use Mentor PADS circuit board CAD, and for the last couple of TrueNAS versions, we are unable to reliably store files on a TrueNAS SAMBA share. The CAD software seems to use some sort of proprietary file locks and after an initial save of a file, I cannot save again. It transitions to "save as" when I try. If I try to save to the same filename, it says "file locked". It appears that file handles persist too long, or update too slowly for this program. I can keep saving under incrementing filenames. This is maddening for several users, and I need to migrate my CAD workers off TrueNAS servers because I can't figure this out. Works fine on Windows servers and I do not have durable handles enabled. I also notice that when looking at directories on the NAS with File Explorer, changes seem slow to register, and I have to manually refresh a lot, when creating new directories, for example. The network is plenty fast. I doubt that network speed is the problem. NFS shares have same problem as with SAMBA.

Running TrueNAS-12.0-U6 on an HP DL380 G7 server with 24G RAM. Dual Xeon.
Quad GB NICs. Active-Directory based LAN with Windows 2016 servers doing DHCP and DNS.

 

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Looks like others have similar trouble.

One particular application cannot save on SMB share - help!

Hi there, thanks in advance for any help. To be honest, I'm hoping to catch the attention of a certain 'Sambassador'... We have just upgraded to TrueNAS core from FreeNAS 11.3. We mainly use the NAS as an SMB file server for Mac clients running Avid Pro Tools, a Digital Audio Workstation. After...

www.truenas.com

I hope some TrueNAS SAMBA expert can help figure out a solution.