Seems like there's a lot of new Trotec owners out there these days. Here's a clip I did to help explain a common problem you'll most certainly see.
This is a rather long video, but hopefully it explains something that helps someone out there. I'm very sorry for the length of it, but it covers things that need to be seen and explained. There's a LOT more to this than this one video so I'll work on going into more detail once I get some feedback on whether or not this helped anyone.
Once it starts playing, click on the gear in the youtube control panel and change it to HD. It should be recorded at pretty high quality and it best viewed in HD.
Any questions, just ask and I'm sure someone here can answer it!