I had the same problem when starting up. Did some changes with the <visible> command and now I fixed it.
Pretty sure you can fix this..
Turns out the problem is caused by a bug in the MP-TVSeries plugin. See this post. I've altered the xml a bit to always show the correct panelbackground. However, i assume you enter the plugin in series view and not a grouped view (genre or channels). This only applies to the very first time you enter the tvseries screen after starting MP, after that everything should work as expected.
Netherlands