Thank you John and Carl for your detailed responses to my earlier questions.  I found them helpful.

1.)  However, I'm still experiencing some issues with the file management.  I split a project into two movies to simplify the editing.  When I do a "save as" of the project, it seems to work.  But then, when I access it again to do further editing, it brings up three tabs above the timeline:  the first tab on the left is Part 1, another is Part 2, (or vice versa)  and the third is the file name I had saved the project to  -- except that this tab is empty!   I had no such problems with MEP 16.  Have spent over a month reading the manual, and other threads in the forum, trying to figure this out.

My goal has been to produce a movie of our recent trip and burn several copies to Blu ray discs for the others who had accompanied us.  (Before that I tried burning the project onto two DVD disks, but the resolution was not clear, and peoples' faces were like blobs.)

2.)  After the burn screen froze and crashed a number of times,  and the templates weren't responsive,  I was finally able to burn both movies onto a Blu ray disc the other day -- but the burn menu screen shows 3 movies, of which one is totally empty.  The final menu page shows two parts with images, and a third part which is black.  Was  afraid to delete the empty file, because its title was the one I had given to the project as the final "save as" version.?!?

3.)  Another problem is that the title editor has ceased to work.  When I try to add a title to a video object instead of a broken line box appearing that I can type text into, what I get is a black box, with the check mark and delete button in white in the upper right corner.  Any text I type is invisible as I'm typing it.  When I then click on the check mark, the text appears but also the word "title" and sometimes the text repeats and repeats until I delete the whole thing.

4.)  A fourth issue is that drag and drop doesn't work for me.  To get an object from the media pool to the arranger, I have to get it first into the preview screen and try several times to get it from there down to the tracks.

Thanks again for your help.  Any suggestions?