garageCube

There's a movie folder player, in the Generators section.

The Movie Folder Player is in the Generators.

I tried to click the "+" symbol next to the "Generators" tab but it would not open

That's strange. Can you try from the thumbnails vie of the medias ?

If it doesn't help, can you send your log file ? It's located in
Windows:
C:\Users\your_login\AppData\Roaming\Garagecube\MadMapper\Logs\
You can paste this in file explorer address bar: %AppData%\Roaming\Garagecube\MadMapper\Logs\
MacOS:
/Users/YOUR_LOGIN/Library/Logs/GarageCube/MadMapper/
To access this hidden folder easiely you can: open Finder, choose menu Go / Go to Folder… and paste
~/Library/Logs/GarageCube/MadMapper/

Indeed. You can create a long playlist within MadMapper that includes all your desired videos,fnf organized by day or using tags. You can then use the scheduler to automatically switch playlists on weekends or holidays.