Looks like a problem with Operating System rights.
Like for instance software installed with administrator rights and used with user rights.
To avoid such problems, the software has to be installed with user rights, and used with user rights to.
FYI, our software saves the lightshows in the "home directory" folder (
https://en.wikipedia.org/wiki/Home_directory).
The "home directory" is a system folder which is made for that, but the user must have read/write access for this folder.