Angle Slider freezes
I experience sliders for angles freezing:
I can use the spacebar to start/stop animation of the slider.
I can use the slider displayed in the algebra pane to adjust the value.
But I cannot adjust the slider displayed in the drawing area.
I experience this repeatedly:
Start with a working version of the construction, make a slight tweak
unrelated to the angle, and the slider freezes.
What could be the cause, and how do I fix it?