Projects with the same UUID can cause issues (created by copying an existing project)
To update the UUID to make it unique, open up the fdproj file in a text editor (and
it might need to be one that handles large files well if the project is several
megabytes in size!) then at the top you'll see a line that looks like:
uuid={xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
Each one of those x's should be a hex digit, i.e. 0-9 or
A-F. You can use this to check if two projects have the same UUID.
You can change its value if you like, though you'd want
to use a UUID generator to make sure it's properly unique. This one seems like
it would work: https://www.uuidgenerator.net
After you change it, the first time you reopen the
project in FD you'll get a warning that reads "Flexi-deck is unable to
determine the source of this project..." because the file's checksum will
no longer be correct. All you have to do is re-save the project and FD will
automatically fix that.