About Manual.
In the "usecase.pdf", at the end of the document, where there is the "Note: for correct ... project.", I would add something like "To avoid to know how many tracks you need, you can use Nest feature (see Nesting sub-chapter)".
More I would suggest to insert the word "sequence" near "Sub project", because a professional user know so; and in Load window you find "Nest sequence" option. You can write in the point #2 "...also saved a Sub project (usually called sequence)..." and then to use always the word "sequence" instead of "sub project".
And, for my personal taste, I would change the title in "Working with the sequences" and then, I think, is needed a more complex explain in that sub-chapter. Only an idea.

On the manual, in "Camera and Projector" section, I think it would be important to add the two images that you find in "Cinelerra CV Manual.htm" and I add here. I know, they are drawn by hand but it is important to understand how camera and projector work.

GG looked at the code and the way the Overwrite works was intentionally written to work this way (it is a feature, not a bug). To me it makes good sense, because you could very well want the autos/plugins you put in the Master to be in effect always for smooth looking videos.

Thanks GG. And I think you are right, Phyllis. May be that you want put a part of a sequence in the Master project without overwrite the Master project's effects.

Also, I will find out about a warning message as recommended in "about note 1", but I am forecasting that gg will not want to.

Okay. Thank you.

IgorBeg