MSLogon I Stopped Working in 1.4.x.x

[sla_172001]

Been using uvnc for awhile with few changes to my config file, just updates here and there. I use MSLOGON I for single domain authentication...

[admin_auth]
group1=VNCUsers
group2=Administrators
group3=
locdom3=0
locdom2=1
locdom1=2

VNCUsers is the group on the domain with user accounts allowed remote access/control rights via uvnc. It's worked flawlessly through version 1.3.8.1 BUT stopped working with the 1.4.x.x release. I've tested every thing from 1.4.0.5 to the latest. I receive the authentication rejected message when the username and password is entered. IF I rollback to 1.3.8.1 or any version earlier WITHOUT changing a single line of my config file, it works. I don't have anything to go on. Here's what the mslogon log file looks like...

Connection to 1.4.x.x server....
15/03/2024 11:23:07 Connection received from x.x.x.x
15/03/2024 11:23:07 Password authentication accepted from x.x.x.x (Interactive) (ID:1)
15/03/2024 11:23:15 Connection rejected from client x.x.x.x using *userid* account
15/03/2024 11:23:15 Invalid attempt from client x.x.x.x

Connection to 1.3.8.1 server...
15/3/2024 11:29 Connection received from x.x.x.x
15/3/2024 11:29 Connection received from x.x.x.x
15/3/2024 11:29 Connection received from x.x.x.x using *userid* account
15/3/2024 11:29 Connection received from x.x.x.x
15/3/2024 11:29 Client x.x.x.x disconnected

The log entries are the same Win 10 machine literally 6 minutes after removing 1.4 and installing 1.3. Same domain account in the VNCUsers group was used for both tests. Any ideas? Thanks.