i've post this question in the matrox rtx forum for a solution. its seems that no one is able to help me out.
in my project i imported jpeg images, and avi (uncompressed). while realtime preview in the timeline, i got xt logo. after export>matrox realtime export to disk>entiretimeline>mpeg_2 ibp i also get the xt logo at theses images and avi places.
may someone help me out of this problem.