Correct me if I’m mistaken but I’m afraid there is a problem in the
ctrl-k shortcut behaviour.
Currently it seems to work only on nodes with internal links already. When I try to use the hyperlink menu option and shortcut on a node without a hyperlink I don’t get a popup window dialog to enter a custom URL (the expected behaviour). It does nothing.
I verified for the same behaviour in both Google Chrome (Linux) and Firefox (Linux).
Hope you are able to solve (or clarify) this issue soon as always.