Scroll during playback issues.
I looked for this and can't find it. We had a discussion back in version 2. During playback, you can scroll up and down to see various staves in a system when the system is larger than the screen display. When you playback and all of the staves do not fit on the screen, it is impossible to see the last staff unless it is the middle of 3 systems being played. When you scroll down to see the last staff, the display jumps back up and the last staff disappears below what can be seen. Also, if you scroll to see the bottom of 2 or more systems, when it gets to the next page, it does not always pan that page so the system is visible. This is true of version 3.1-beta. A good sample score is Psalm 119 III Gimel and Daleth.mscz. Set up the zoom so you can see the Piccolo through the Bassoon II and press play. Use your scroll wheel to try to look at the Bass staff during playback and observe that at best you can see about the top half of the staff unless there are multiple systems.
I see both of these issues in this score.