It seems like scrappy8 is not happy with the stage overlay function on jacaranda, and that may be a side effect of it being developed with the upcoming Andromeda release in mind, since it is not an issue at all in Andromeda test releases.
A simple fix would be to edit the /MUOS/application/Scrappy/mux_launch.sh launcher to comment out the stage overlay set, in line 66.
It should go from
SETUP_STAGE_OVERLAY
to
#SETUP_STAGE_OVERLAY
That should solve the issues for the time being, but overlays won’t work, so no volume/brightness bars, and no colour corrections, while using scrappy.