I had tried that and it opens in Sub Editor or Sub Movie as it is titled.  Screenshot attached.  Many thanks.

Not sure why I can't put two screenshots on but here is the other.    

Here are two screenshots showing the difference when using 'right click'.  

I'm sorry, I'm not terribly good with terminology.  Yes I mean project and it is saved as a movie.axp file which I then subsequently inserted into the timeline of my main film.  However if I clear everything and bring the movie.axp project file in question onto the timeline on its own (where it is titled Split Screen Template ...

I have Studio 23 Basic.  I made up a film clip which includes some split screen frames and saved it.  Later I inserted the clip into the main film.  Now I want to edit the split screen section.  So by using the ‘Open in Sub Editor’ command I have worked backwards until the timeline shows the ‘Split Screen Template ...

Thanks again Tony for your help, much appreciated.

Thank you Tony for your help.  I was able to highlight all my studio projects and ''re-link'' successfully and amended all the future destinations to my F: drive.  I then copied the Videos folder from my C: to F: drive.  To free up space on the C: drive I then deleted the contents of the Videos folder, where my Captures ...

Can you please advise me on how to move all the files you mention?  I 'cut & paste' all the contents of the various folders which are shown in the Pinnacle Import, Save To list from the C: drive to the F: drive creating new folders with the same names.  The result was I lost all the projects so I swiftly reversed all my actions and ...

Thank you, it works!

I have already tried Reset.  However I have repeated the process but separated the clip, which I hadn't done before.  It plays back fine!  I have taken my own clip which I have been having problems with, reset the time remapping and it also works fine!  I am mystified as to what I have been doing wrong, if anything.  ...