I have a 60 watt Chinese-made laser engraver. It vector cuts just fine and raster engraves fine, but when engraving vectors or text it sort of "fades in" on the first few rows, like there is some kind of gradient setting along the bottom. This happens in Coreldraw 12 and in Lasercut 5.1. I even tried exporting .ai from Coreldraw and importing into Lasercut and it does the same thing. Any idea what would be causing this?