I read this thread and also littlesat's post on github, but I am not sure that I really understood what is to be done in order to get it to work properly.
I installed OpenPLI, installed MediaPortal 7.5 and then also had to install Python-argparse.
Now I tried to find the files mentioned in the GitHub post in order to change them, but I can't find them on my box?!
Box is Vu+ Solo², OpenPLI 4 (Image 2016-06-10), MediaPortal 7.5.0 from the link dhwz posted in another thread.