At least we know it's not your PC issue entirely. Have your tried today's update?
Assuming it's an update that only works through the app, and not one you can just download from itch.io (which says it was last updated 3 days ago) then no, because the old, working version I have won't (or can't?) auto-update, and the new version is still broken.
Also, I thought to try the browser version in Chrome, instead of Firefox which I had been using, and it turns out it only partially loads (same as what Waltz 89 got) when using the browser version in Chrome.
Is there anyway I could just get the current version compiled with the latest release of the node-webkit? I've been waiting for 127 days. I would just use it in the browser since it works fore me there but it looks like you have to be a patreon member to unlock all the export options. EDIT: I just saw that you unlocked the online editor for another user having the same problem. Is there anyway you could show me some love too?