i seem to have fixed this problem on my own.
The theme is not compatible with PostgreSQL, only with MySQL.
As soon as i realized that, and switch to mysql everything worked fine.
not my choice of database, but it will have to do for a while :(
now im lift with the creation of a page... the pageheader shows UNDER the content, and the content is not nicely flowing in a container, but directly to the left page side.
is it possible to make the pageheader apear ABOVE the content, and align the content with the logo??