Hi,
I've done a lot of editing with both of these and have not noticed the problem. However, I may have myself unintentionally trained to avoid it

If you could give me the precise steps you use that show the problem, it will help us to better figure it out and slate it for fixing.
For example, here's what I just tried out successfully (no problems) going back and forth between Piano Roll and Text/Chord names:
- Start Composer
- Open the last file I was working on from the splash screen
- Click the Piano Roll tab (cursor goes to "Select" mode).
- Clicked on a note and used "D + Right arrow key" to increase its duration
- Click the Text tab
- Click the Chord Names button (mouse cursor goes to "Add" mode), then click in the score and add a "D" chord name.
- Press Tab to advance to the next chord name spot.
- Click the Piano Roll tab again (mouse cursor goes to "Select" mode)
- Select the same note as (4) above and use "D + Left arrow key" to decrease it's duration.
No flickering or reversion for me for the above steps. What am I missing?
Thanks,
Sherry