Unable to use application from network share as standard user on Windows 7

Hi,

I have an interesting problem.

Network is 2008R2 AD with Windows XP and Windows 7 clients.

We have an application on a network share that gets mapped with Drive Maps to the workstations.

We use group policy shortcuts to place a link on the desktop.

Now, the application is a client app that opens a network connection to a database server.

This works as intended on Windows XP, but not on Windows 7.

If I start the app with the shortcut (or directly from the share) in normal user context, I get complaints from the app that it cant find the database server, even if it knows of both ip and port.

If I copy the app to a local folder on a Windows7 computer and start the app in normal user context, it works as intended.

So, any ideas of how to get it to work as normal user from the network share?

I've tried disabling the Windows Firewall and UAC, but it does not help.

It does not help either to set the user as member of Power Users.

I've tried to run the app under Windows Application Compatibility toolkit, but it does not offer any suggestions or errors I can see...