I just upgraded a project to 17.10.0 and now my structure pane is empty. Ticking or unticking the Only show items with auto-IDs does not make a difference. Nor does rolling back to 5.1.4.
You will need to clear your browser cache. We have an advisory with instructions here => https://support.avoka.com/kb/x/1SF8B
I just thought of that before I saw your reply. Should've been the obvious thing to try.