[NTG-context] texexec does not Rotate right on pdfarrange

Hi everybody, I've got a PDF saying /MediaBox [ 0 0 842 595 ] /Rotate 270 but on concatenating it via texexec to a second PDF saying /MediaBox [0 0 595 842] the first one is displayed landscape and cut to half. How can I prevent this. Does texexec ignore the rotation commands? Need I parse odd PDFs myself? Thanks much for any hints