The light-background colour scheme needs improvement because in some situations it isn't working well compared to the dark-coloured scheme: When you browse someone's shared files, the files you already have are shown with a colour very similar to the background colour in the light-background scheme, whereas this doesn't happen in the dark-coloured scheme.

Are you talking about the default "Light Background" dark text setting selection ?

I suppose that could be annoying however you can tweak it yourself in FOPNU Settings under "Custom Colors" and then save the resulting ".color" file by using the function found in "Color Scheme->Custom.colours File->Save , to suit your choice.