In my objects library I have (not including user) 21 categories of which 7 now have items that are difficult to see or you cannot see at all due to the coloured background. It's ok if you individually click on an item to view it, but this makes it useless for searching for items.
The coloured background is fine on other items with the same coloured background even in the same category. It seems to be random. I could go through my stock and change them individually, but if this problem is fixed it may mess up the changes.
Has any one else had this problem? I would put it on Discord but I cannot get access (my email which I have not changed is refused on my location being different, which it is not).
Thanks for any forthcoming help.

If you double-click the thumb it will open a window, where you can change the background.

Thanks 3com, I have moved this to GitHub as I have found and additional issue with the object library.

You are welcome