I am having an issue similar to strangeglyph where level 2 just doesn't work. I scroll up the the node (with mouse dragging and arrow keys) and nothing happens. I've zoomed in and out, put the node in the centre of the screen and moved it about, tried pressing n to see if that fixes it and nothing helps. I am playing on Windows.
Ah no! Hmm, so ok: can you go to the game's save folder (see the FAQ) and send both .log files to bighandinsky@gmail.com? (Title "Tutorial bug" please)
After that, try playing it again, but take it super slow - don't move the node tree at all until the relevant panel shows (I think the bug is due to a very specific timing when moving the map. I thought I managed to address it in a patch, but sounds like I didn't 😬)