Was able to reproduce the second crash using the file and steps reported.
For the first case, I'm not sure I did the steps correctly as I did not get a crash, but I did see a bunch of warnings spewed to the console:
WARNING: Requested update while update in progress, counter = 4 WARNING: Requested update while update in progress, counter = 4 WARNING: Requested update while update in progress, counter = 4 ...
Was able to reproduce the second crash using the file and steps reported.
For the first case, I'm not sure I did the steps correctly as I did not get a crash, but I did see a bunch of warnings spewed to the console:
WARNING: Requested update while update in progress, counter = 4
WARNING: Requested update while update in progress, counter = 4
WARNING: Requested update while update in progress, counter = 4
...