To zgloszony bug.
A z rozwiazan to takie sie znalazlo.
To fix that do:
cp /usr/share/doc/moc/examples/config.example.gz ~/.moc/
gunzip ~/.moc/config.example.gz && mv config.example config.
Edit config, find "# Layout1", uncomment and enjoy moc.
Or edit your existing ~/.moc/config file and uncomment the layout1 section.
# Default configuration:
Layout1 = "directory:0,0,50%,100% playlist:50%,0,50%,100%"