startup OBD from _ustn_homeroot

Hi,

now we all are working from home (covid) I have some problems for some users.

for the most of all users, every thing is working well (but slow) on the VPN  (dataset and files are on the business-server)

preferences for all users are stored on the server: 
_USTN_USERNAME                    =   $(USERNAME)
_USTN_HOMEROOT                  =     $(_USTN_ORGANIZATION)USERS/$(USERNAME)/$(computername)/
_USTN_HOMEPREFS                 =    $(_USTN_HOMEROOT)prefs/
_USTN_PREFNAMEBASE          =    $(_USTN_HOMEPREFS)$(USERNAME)

eg: B:\Connect\Configuration\Organization\Users\rbe\SIGNUM042\prefs\RBE.upf

so we have a user directory, organized per user, and then per machine (a user works on different machines and settings are different)

when a particular user starts OBD, the wrong settings are read
OBD reads from: C:\Users\rbe\AppData\Local\Bentley\OpenBuildingsDesigner\10.0.0\prefs\Personal.ucf
so:  the wrong directory, and wrong file
OBD starts in installed modus, but after this it goes further and goes to the server dataset
after adjusting settings - and save settings - the settings are saved to the wright directory unther the wright name:
B:\Connect\Configuration\Organization\Users\rbe\SIGNUM042\prefs\RBE.upf

but after restarting OBD, OBD is NOT reading this file but the initial personal.upf
so: none of the new settings is loaded.

how to prevent OBD reading "personal.upf" (if server can be found - on an active VPN connection)
and loading in first startup-steps the right "RBE.upf" on the server
because these settings are not re-written during startup process like other variables

are there some switches I can attach to the program start shortcut ("C:\Program Files\Bentley\AECOsim CONNECT Edition\OpenBuildingsDesigner\OpenBuildingsDesigner.exe") ?  
or how to fix this