I have a fairly complex project. I added one block really for the purpose of trying to measure a distance since I haven't found a tape measure equivalent.
I'm done measuring, but now I can't remove the block nor make any changes to the project. It says "Saving..." then eventually times out and says "Session lost or expired".
I've tried with Safari, Firefox and Chrome all on a Mac. All have exactly the same result.
I've tried other simpler projects and they seem to be saving fine.
Any ideas? I was just tweaking a final design. By far my most complex design in tinkercad :(