SSL VPN Client issues von Win 7 64bit

Hi everyone,

I've been searching for a while now but have not found any suitable solutions.
We are experiencing the following issue:

- Astaro SSL VPN client, newest version
- Windows 7, 64bit clients
- User do not have local admin rights
- Astaro SSL VPN client is executed as administrator

Everything runs fine, connection can be made, tunnel is working, but:
When connected, the tray icon does not respond at all. Context Menu cannot be opened etc.
This happened on multiple clients, VPN client was reinstalled, didn't solve anything.
If the user has local admin rights, the VPN client works as expected.

Is this a known problem? Any hints?

Thanks in advance!
Lorenz