Yes, I just made sure the system was up to date (sudo apt-get upgrade -y; sudo apt-get autoremove --purge), cleared all Chrome cache (including Hosted App Data), and did a reboot. When I loaded Construct 3 back up, it crashed the first time I tried to save.
I also downloaded the 'stable' Windows editor to see if it could save. I didn't even make it that far - the preview is completely black and does not work.
Tried Chrome on Windows, same preview issue. Also same saving issue.
Tried Incognito mode - also crashes.
This is really unacceptable. How do I reach out to someone official to request a refund?