Running a single program many times may not produce the same display, if autoscale is left on while objects are created, then turned off.
For an example, run tictac.py several times. Sometimes there is black space around the edges of the grid, and sometimes the grid extends to the edge of the window (i.e. the camera is closer).
Disabling autoscale explicitly (rather than by setting scale or range) now blocks for two frames to ensure that autoscale is up to date for the latest primitive additions.