Many thanks for this - it has solved my problem.
I thought I'd tried double-clicking but maybe I wasn't close enough to the
existing line.
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Sent from the Quantum GIS -
Hi,
I'm not sure the Vertex editor currently allows you to add new vertex: You
can delete them, move then by changing their coordinates but not (yet!)
adding new ones.
You should double-click on the feature with the node tool in order to add
new vertex. See doc at
