From what I'm seeing in the images you've posted, it looks like your having a problem that's very common for people converting and preparing images for Scal. It looks like each shape in your trace is surrounded by a complete path. So far as I can tell from your posts, you never broke the path apart, is that right? If you didn’t try breaking the paths apart yet try this:
1. select the tracing of your lace frame and
object > ungroup, then from the Inkscape toolbar choose
Path > break apart.
( when you do this everything in your trace will probably turn black, but that's o.k.)
2. Set Inkscape to outline view mode, (
View > display mode> outline) and you will be able to see what your working with.
3. While in outline view mode, select any unwanted lines and delete them.
4. Return to Normal view mode to make sure you have kept the shapes you want.
If you have trouble with any of this, or have more questions please don’t hesitate to let us know, and we will try our best to help.
From your Scal screen shot it looks like you have some broken paths where the edges of the drawing touched it's image boundaries and confused the tracing function. The easiest way to clean that up and repair it, would probably be to open a copy of the bitmap image in your photo editing program, and extend the canvas, to give the drawing more room on the page. Then remove anything you don’t want ( like that big flower in the centre) and save this new copy before moving it into Inkscape to do a new Tracing. Import the new image, and scale it to fit the Inkscape page leaving a little white space all the way around the edges of the lace frame. Do the bitmap trace again, and clean up the tracing for use in Scal following the steps above. Don't delete the imported bitmap image until you're sure your tracing is ready to use, because it will help you keep the parts of your tracing lined up while you work. You can just hide the bitmap image if it gets in your way.
Here are links for some video tutorials on the subject of converting a bitmap image for Scal, by people who understand this process a lot better than I do.
http://www.youtube.com/watch?v=YmLMLSY_ttM&list=UURHLGfeOR5D4IpX6vtEBGCA&index=70&feature=plcphttp://www.youtube.com/watch?v=n_DrqXkw0Bo&feature=player_embeddedThis is a forum that lists some good cutting resources, and lists links for even more tutorials.
http://www.inkscapecuttingdesign.com/viewtopic.php?f=10&t=17If you haven't already found them, there are a lot of nice blogs by people who use scal with inkscape and offer lots of wonderful resources
as well as tutorials. Penny Duncan designs, and pappasue are two of them,but there are lots more listed at the Inscapecuttingdesign forum.
I'm sorry I couldn't find the tutorials in Dutch, but maybe a google search will let you find some.