On FB4 when a fixture's intensity is not loaded into the programmer window and using the delta down key the current level is touched and the level is not lowered. The same happens with the Pig modifier. The delta up key functions as expected.
In an editor window active palettes for selected fixtures are not highlighted in their respective windows.
On FB4 the ghost keyboard light still comes on unexpectedly and non-recreatably. Usually when a key is pressed but recently noticed it happen when a fader was moved.
On FB4 when using the trackball scroll wheel to scroll in an unfocused background window the contents will reveal on and off over the foreground window.