Blackmagic Forum

If you set the Background Opacity in a Text (not Text+) node in a Davinci Color Managed timeline (not sure this makes a difference), you can change the opacity with the slider, but if you then double-click the word "Opacity" to reset to the default, the opacity resets but the slider does not move. If you then move the slider, the actual opacity jumps to the current location of the slider.

If you set the outline of text (Stroke Size) above zero and then turn off the Stroke with its effect switch, the stroke remains.