[DaveBlake]

Yes, from my perspective the issue is just the fact that the music visualization starts even if it is disabled by default in a clean installation of Kodi.

That is bizzare isn't it - viz addon disabled, Settings>Player>Music> Visualization set to "none" and yet Milkdrop runs.

It is down to the default guisettings.xml value having
<setting id="musicplayer.visualisation" default="true">visualization.milkdrop</setting>
while the milkdrop addon is disabled by default.

But because the addons are disabled by default on install, the settings GUI can not be set to visualisation to "Milkdrop" (a disabled addon), so displays "none". Hence the main settings menu can not be used to change the saved value to "none" because it already has that value on screen.



The fix is wonderfully simple - ensure that guisettings.xml  has<setting id="musicplayer.visualisation" default="true"></setting> by default.

Meanwhile as a user work around you can clear the viz from the player OSD, as that shows the current value ("Milkdrop") and "none".

But I am left thinking that runnng a viz addon should check that the addon is enabled first too, not just rely on the user not being able to select a disabled viz.