Pro Tools won´t start with LDAP (OSX Open directory) network account

[Rob-D]

Hello DUC,

we are running an OSX Server with network accounts (LDAP). The Users log into our Client Macs by using these LDAP-Accounts.
This works without any problems until version PTLE/HD 8.0 cs3. When updating to PTLE/HD 8.01 or higher Pro Tools won´t start when using a network account. The error message that occurs is:

"Could not complete your request because Assertion in "/Volumes/Development/vb_devbranch/_boondock/AlturaPorts/NewFileLibs/CoreFoundation/MacBuild/../../Sys/MacOS/Sys_FileUtilsMacOS.cpp", line 569 while creating "THE USERS NAME HERE" while creating "Library" while creating "Preferences" while creating DAE Prefs"

What I can read from this error message is that ProTools is not able to write the preference files that are needed. But why? Trying to fool PT by putting correct prefs (created with a local account) in the Library folder of the network account fails. These problems occur only with PT. All other apps we are using can write correct prefs.

So far we have tested the following configs:
Server: 10.5, Clients, 10.5, ProTools > 8.0 cs3 --> Error (">" i.e. higher than ...)
Server: 10.5, Clients, 10.6, ProTools > 8.0 cs3 --> Error
Server: 10.6, Clients, 10.6, ProTools > 8.0 cs3 --> Error
Server: 10.6, Clients, 10.6, ProTools HD > 8.1 --> Error
Server: 10.6, Clients, 10.6, ProTools HD 8.1cs1 --> Error

Digidesign, please, is this bug known? Is there a workaround?

Rob-D