Background images not saved?

Hi, I just installed Nebula (Jarvis) from the Kodi repository onto an Android 5.1 TV box and I like it very much. It’s refined, understated and clean. Thank you for all your work.

I’m a newbie to Kodi so might be doing something wrong. When I change the Background images via the Browse Image button, accessing my own images on a USB flash drive, some stick but some don’t. Is there a trick to saving these settings?

I may have made life difficult for myself by deleting some of the default home menu items (e.g. Music) and then modifying another default (Weather) to convert it into a “Sports” menu; and I converted the Videos menu into a Movies menu. My new menu items don’t show up in the Background tab so I changed the Weather and Videos background images and they don’t save. But some of the default menu items I did keep don’t seem to save new backgrounds either.

I’m not fit to edit any code so I hope that’s not the solution. Nor would I relish resetting the Home menu to default as it has taken me a long time to set up the submenus. At a stretch, I might be able to find the default directory of background images and substitute my own image files there if you could point me to them.

Thanks for everything.