in a new PCB layout:
- move the mouse to an empty part of the design surface
 - hit ‘a’ key. note that there’s no blue circle (bug 1)
 - move the mouse slightly. note that the blue circle appears.
 - hit the ‘’ key to change trace class
 - note that the blue circle doesn’t change size (bug 2)
 - move the mouse slightly. note that the blue circle changes size.
 
what’s weird is that the trace class change takes effect immediately in the middle of laying a trace, but not before…