multiple instances open when starting an app from gksu

Hello! On my box startup-notification shows an odd behaviour when an app is started through gksu.

- start an app which requires gksu, for example the gnome disk manager;
- provide your password;
- close the app and restart it: the password is now already stored in the gnome keyring, hence the user won't be prompted to re-enter it;
- the app starts up properly, but I get a busy cursor and another istance of the app is shown in the taskbar, which will die out after a few seconds.

I found out this is a problem with startup-notification, in fact toggling the startup-notification flag in the app's desktop file in /usr/share/applications seems to sort it. Synaptic, which comes with no startup notification enabled in its default desktop file, is not affected by this problem. This isn't a showstopper at all, but it's slightly annoying.

Have a nice weekend! Regards, andrea