Just wondered if anyone else had experienced this.
If you import a bitmap into draw and then use the "node edit tool" to crop parts of the image, subsequent tracing causes unpredictable results... a random part of the image gets traced...
You would probably be able to work around that by selecting the cropped bitmap and doing bitmap > convert to bitmap. So now, it is a "simple" bitmap rather than a cropped one.
Another occasion where I find I often have to do that is if a bitmap comes in as a "bitmap object" rather than a bitmap. I'm not sure what the difference is (and I don't ever remember it being a problem in X4) but it seems to happen frequently in X6.