In the new version, the “Advanced” window is not resizeable (as it the 18.11.18 version), so it covers most of the “Presets” window. Dragging it to the right makes the “Preview” window smaller.
Also once or twice program crashed when dragging a video clip into the “Playlist” window.
When I put a transparent PNG on a higher track and the lower tracks are empty, the background now appears to be white as opposed to black as it was previously. I can overcome this by placing a black background on the lower screen. Not so much a bug as a change I wasn’t expecting.