"Acess denied" when using "Open Right/Destination"

Hi again,

First I want to say that I browsed wisely (and widely) all "Access denied" topics from the forum AND the Knowledge Base without results.

So yet another "Access Denied" problem. This problem appeared with SyncbackPro (I never encountered it with the free version)

I understood that it is a windows error and not linked to syncback.

1. When I try to connect to \\MyBackupHost\MySaveFolder\ from explorer using myuser/mypassword : it's working well.
2. From the profile setup : filling the Network tab with myuser/mypassword and testing it says "Success"
3. Now trying to Run OR Simulate OR Open Right/Destination displays : Access Denied.

Tested after a reboot on automatically launched SyncbackPro V6 on a Windows Vista (last word isn't a joke...)