M3rcury could you please try the movies which are imported in MovPic with "Add as blank (editable) movie". After a few more attempts now I think only this movies are affected.
At the meantime I can't open the DVDArt plugin, I get the same error when I click on configure in MP Config.
M3rcury I've uploaded my database and some covers, try to reproduce the behaviour with the movies "Ata Demirer - Tek kisilik dev kadro", "Die Südsee" and "Blood in, blood out".
I go to Movies tab and make a right click on the movie e. g. Ata Demirer ans select the 3rd choice (select cdart manually or something like this). When I select the cover and I've thicked Add Title and Add Logos and hit Preview I get the error. In this way you should confirm the behaviour.