I can take a look tomorrow. I think I know where the problem is:
We did an update from 9.0 sp3 to 9.5 and everything was already imported after the installation of the update. We did not compile the image after the update and the pxe rep was already there. We just created a task for the template.. Is it possible that we have to redeploy the pxe script to the pxe rep.? I can image that the pxe rep provides an old .dll in the Win PE and the new actions which came with ld 9.5 are not supported by the old .dll..