Hmm, there is something funny going on because that 70's image should show, its in the right place, here are some things to check....
1. the folder.jpg image in your first 2 pictures above should not be there, remove it.
2. I notice your 'be-gees' & 'dr hook' images show so examine those to see how they differ from others.
3. Are you sure the folder.jpg images are jpegs ?, did you convert or rename them ?.
4. does the 70's genre 'folder' contain any other
files (not folders) apart from the folder.jpg image ?.
5. do you ever get an error message saying something like 'Unavailable' when browsing tracks ?.
Check the above and report back, if you have no luck I will connect and sort it for you
Ps: the easy way to take a shreenshot is to press (Alt + Print Screen) buttons when videobox is open, this saves a picture to your windows clipboard, you can then paste this into windows paint and save it (ctrl + V).