Comment 5 for bug 559140

I removed preferences.xml and that solved the problem.

> @dopelover - can you test the current build with default preferences
> (temporarily rename or move ~/.config/inkscape/preferences.xml) to
> rule out possibly conflicting preference settings for the new node
> tool?
>
> @JazzyNico, ScislaC - do you have the same problem inserting new nodes
> with a double-click on Ubuntu?
>