Okay, I just figured out this whole darn RscTitle thing. I don't know why a good tutorial on the subject hasn't been made before... these things have been around since v1.0. So I'm going to write a tutorial myself; look for it in the next couple weeks.
However, I can see your problem quite easily:
controls[]={"Screen","Titel1",};
In this line you are supposed to list all of the classes that are in this cutrscs. You have created the following classes: Screen, Titel1, Titel2, Titel3. However, in the above line, you only list 2 of those 4 classes. So OFP doesn't "know" about the last two classes. The line should look like this:
controls[]={"Screen","Titel1","Titel2","Titel3"};