I am running 8.7 and have 3D boxes set under image group, with the 3D Box priorities in options set to default, i.e. I haven't changed options.
I have just imported a bunch of Atari 2600 roms into a clean but upgrade from 8.6 launchbox and I notice that most of the games don't have an image displayed and are set to the default coloured-cube image. If I change the image group from 3D boxes to screenshots and then back again, it shows a few more 3D box images. I can repeat the process to display even more.
I noticed this same behaviour under 8.6 as well and with other rom sets, e.g. arcade.
Is this a known issue and does anyone have a way to ensure that all of the potential 3D images are displayed immediately, as soon as they are imported.
Update: I am running premium and using the refresh all images option doesn't fix it.