hi sam, this has been an issue since i originally purchased my vero 4k back in april 2018. i am on the latest osmc update, and i use a skin called “grid”.
for any visualization, when playing music i only see a black screen with the track title flashing for a few seconds as each new song starts.
i have both spectrum 1.1.1, which i think was packaged by default, and shadertoy 1.0.8, which i have installed from the popcornmix repo. the installation process worked properly, and the addon is enabled and selectable in music settings. however for both of them, only a black screen displays.
with shadertoy, when i go into the visualization settings, the shadertoy preset list is entirely blank. this is despite the fact that i can verify all the frag.glsl files are present in /home/osmc/.kodi/addons/visualization.shadertoy/resources
in the past months i have occasionally tried to clear and reinstall the shadertory preset, with no difference in behavior. i’ve seen on scattered forums that others have had this same issue with various kodi/omsc gles systems, but have never seen anyone post a solution.
IMMEDIATE UPDATE: well, as i was typing this, i realized i had never tried it with any other skin. i flipped back to the osmc skin, and now shadertoy works.
leaving all the above in case it comes up in someone else’s googling for a fix.