samba - Dec 2014 - After updating to Zentyal 4.0 all printer drivers are missing in MS RSAT printer manager

Hi!

I've updated our Samba4 AD-DC from Zentyal 3.2 to 4.0 (Samba 4.1.11 to 
4.1.13).
Because the guys at Zentyal have changed the path where Samba is 
installed from
/opt/samba4 to /var/lib/samba and moved the bind_dlz.so files from 
/opt/samba4..
to /usr/lib/x86_64-linux-gnu/samba... it takes some time to update my 
configuration
files so that all was working again.
But after all i have some trouble to get the print server working again.
When i start the printer management tool from the Microsoft Remote 
Server Administration Tools,
all printers i had installed before are listed, but there are no drivers 
installed anymore.
I have looked to the printer share at \\myserver\print$ and all driver 
files are already there.
I can also install new drivers with the printer management tool and it 
copies all files to the
print$ share successfully.
So what goes wrong here? How can i get my printer drivers back without 
install them again?

Thanks for help