R514 - Network tree is not visible after restart

[HeiWoMa]

Hi,
I navigate to: \\Server\Setups\OpenOffice\Version 3\3.2.
In the Tree I get this view:
Netzwerk
+ Server
|-+Setups
|-|-+OpenOffice
|-|-|-+Version
|-|-|-|-+3.2

Close FC and start again. Now I see only:
Netzwerk
>OpenOffice
Note: there is no Plus-Icon before OpenOfffice it's just an arrow.
But in the Fileview on the left side I see files from the folder \3.2
It's not possible to expand the tree. Even when add new Tab I get the same. I must activate a Tab where e.g. C:\ is active and the Ctrl+T for a new Tab to be able to navigate on the Server again and get a Tree.