I am on PC using Chrome, the error message says system error 3:117
I also had this bug (first load didn't work, second load ok). Perhaps it's due to the way save data is created, and something is created on the first check that allows the second check to avoid the crash?
On web, attempting to open the editor also results in a crash to desktop, something is calling `notify(msg_str)` with a nil value but no stack trace to follow.