Here are the changes in the first fragile release leading up to this:
Feature: Added Select Location attribute to multiplexer,
demultiplexer, (decoder still to do)
Bug fix: In customized circuit appearances, labels would be given a
color based on the fill color for rectangles/ovals/polygons rather
than the color selected for text. This color was by default white, and
so they appeared invisible.
Behavior change: With transistors and transmission gates, a floating
value is passed through as floating regardless of the value of gate
(including a floating or error gate value).
Behavior change: When clicking the currently viewed circuit, the
circuit attributes are shown but no tool to add that circuit to itself
is selected. This also happens with triple-clicking a circuit: The
view is switched to the circuit, but the tool is not selected for
adding instances to itself.
-Carl