Here's a strange sequence:
Create new show.
In Fixtures, add a fixture. Assign to DMX #1.
Flip to to Steps tab.
Adjust sliders for fixture.
Go back to Fixtures tab and move the fixture to a different location.
Go back to Steps tab.
The fader sliders in bottom left still show the fixture in its original DMX #1 location.
I understand now that I need to click "save DMX addressing" after moving a fixture, but this is new behavior in v7 and initially confusing.
When leaving the Fixtures panel, there needs to be a reminder dialog. Something like, "Do you want to save the changed DMX addresses?"
It should probably also say, "Warning: All programming for moved fixtures will be useless."