I've found a fix for the background images problem.
1) Download the attached zip file and unzip it on your desktop
2) Using FTP, rename libshowiframe.so.0.0.0 stored in /usr/lib/enigma2/python/Plugins/Extensions/ProjectValerie as libshowiframe.so.0.0.0.orig (to save the original lib in case of problem).
3) Copy the new extracted libshowiframe.so.0.0.0 in the same folder and set permission 755
4) Reboot your Vu+Solo² (Reboot is mandatory)
Now on my Vu+Solo² background images are correctly in sync with the selected movie.
Next frontier will be Animated Background...
Max
Nice one, thanks! Good work.