@RV Hi, I don’t know if it can help, but I have noticed that the “~” shortcut to go tho the /home/pi folder does not work on the scripts.
So when you do the same commands manually everything seems to be OK, but when you run the scripts then you get a bug.
The solution, in my case, was to replace all the folder shortcuts (as ~ for home folder) with the complete explicit path inside the scripts.
Good luck
Braik

@Mar
Hi there,
I had the same problem and the I have realized that node serveronly was not launched.
The problem is that the command :
cd ~/MagicMirror was not working, so I have changed it for
cd /home/pi/MagicMirror
and that’s it.
Hope this can help