Comment 4 for bug 505789

This is caused by my recent change to fix bug 428884. I'm slightly bewildered why we haven't seen issues like this before, as the method I chose for inhibiting the screensaver is used elsewhere already (eg, Totem uses the same method when not running under GNOME, for example when it runs under XFCE).

Anyway, I'll look for a better method to do this this evening