Bert,
I apologise. It seems that I only know half my onions
REGARDING PART MARKERSThere are two settings that need to be activated to have the part markers on the left of the screen. I forgot to mention the second one. These settings are...
(a) The one I previously mentioned under "Display Options". (This is one is the global setting.)
(b) There is also a setting found under "Song Settings". (This is the one that can be turned on and off for each song.)
Right-click on the Chord Sheet and select 'Song Settings'. Now make sure the "Sections on a new line" option is selected as shown below by the blue rectangle.
REGARDING THE VIDEOThe problem you describe is one that I have previously reported to PG Music's Support team. In the mean time, you can get the other pages of chords to show on the video by activating "Scroll Ahead" as shown below.

Hope this helps,
Noel