You have given me hope
I followed the steps, and here are the results from my experiences afterwards:
1. I started a party mode playlist, and the first selected song (Shakira - La totura) displayed normal fanart OK in visualisation mode (this artist has not an /extrafanart folder available. The name of the song is quite describing to how I feel listening to this type of music - not exactly my cup of tea, but I am now digressing, so lets move on...
2. I then queued an artist with /extrafanart available (Coldplay) and pressed TAB in order to go back to visualization screen with Shakira. Shakira is no longer showing of her fanart anymore, and inspecting the debug log it may look like the skin is now looking for /extrafanart from Shakira, not the main fanart ?
3. Executing NEXT brings up Coldplay, and the fanart slideshow works. Hurray!
The fanart is animated (the fanart moves around on the screen) which makes me a bit seasick - hopefully it is possible to turn this movement off ?
4. When excuting the following tracks which to not have /extrafanart available no fanart is being displayed anymore. It now looks like the skin is only looking for /extrafanart images ?
Here is the full debug log :
http://www.pastebin.org/69978
I guess the results of my testing looks promising since the slideshow from smb shares worked:-)
Thank you for your kind assistance so far and let me know if you would like me to perform additional testing.
Best Regards,
Thomas