I have a single JPG on the timeline of a new movie. In Video effects > Brightness/Contrast I reduce its Gamma level with the slider to 40 (I like round numbers). But on releasing the mouse it reverts to 39. Consistently. It seems 40 is a verboten number.
So I enter 40 manually and press the Enter key. The 40 remains displayed. (Unlike using the Tab key, my habitual choice, which doesn't need my mouse hand). But on returning focus to the timeline window the 40 reverts to the zero default. In fact any entry made manually doesn't work.
Terry, East Grinstead, UK