Files opening in Nautilus instead of their default applications?

[skooterz]

Whenever I try to open a file using a launcher such as Gnome-Do or Synapse, instead of opening the file in the default application (which I have double and triple checked to make sure that it wasn't set to open in nautilus), it opens the folder the file is in using Nautilus. The Firefox add-on Downthemall! seems to have this issue as well. Does anyone know why this is happening? It just started happening out of the blue a week ago....

[cedardoc]

I have this problem too... any ideas?

[forbajato]

Another sufferer from of this problem as well when using the Dash in Unity. Maybe it is a "feature" of the Unity desktop?

thomas