Jase00 For the record, I regret my last post. I should have just said 'hey some of the layout data is in his screenshot' and left it at that. But sometimes I get carried away, which I did in this case, and I apologize to the Construct team for it.
AFTER I made that post I found Construct already catches that error, that's why instead of blowing up, it shows the screen including "oops there was an error try ... clear your browser cache", which does indeed solve the problem. In other words - what I suggested - they are already doing that.
If it's related, and I stress IF, it probably gets them no closer to the root cause anyway (why is the size being saved as 0 in the first place) and that's when it all becomes speculation. Right now off the top of my head I could throw in a dozen different theories based on my experience elsewhere. These theories have nothing to do with Construct itself, and could be practically impossible for Construct to replicate, even with a huge commitment of time.