Hey there,
so this is again error message (in english this time^^):
http://abload.de/image.php?img=crossdj34zuml.pngThis is how it is working in a freeware programm:
http://abload.de/img/crossdj2j1uhp.pngIn another trial version:
http://abload.de/img/crossdj12xu2z.pngAs you said, I m confused too. Because I try to select the device, and I do not try to change any sample rate or whatsoever.
Edit:
Ok finally I got it right. For anyone who comes up with the same problem:
- select the onboard/standart device (in the DJ Cross Settings)
- change the Hz to 48000 or 96000 in the DJ Cross Settings
- now you can select the USB Device (in the DJ Cross Settings) (if you keep it at 44100, like I did, you cant change it. And the error above will display.
Strange, but I tried it several times. So I think it is stable 
Thanks nevertheless for your help. I m impressed how fast I got an answer!