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I wonder Why:
Every so often the display seems to get out of line right about in the middle vertically, and it is hard to read. Shutting it down is the only way to reset it?
Is there a limit on the number of colors used or the size of file, because sometimes I can not get the file to download.
At times the operation just hangs in the middle of downloading and never finishes, I have to pull the USB cord to get it to reset. Shut the program down, Insert the USB cable and restart it, wait about 2 minutes and then it works again.
Sometimes when I press the RESET button it goes to the X switch fine but it continues to
the Y axis switch over and over again for about 30 seconds before it resets. Then it works fine the next reset. Think it has a mental issue. I sometime beat my head against the wall. 
Anyone created a Test pattern file that can be used to find optimum speed and power?
Something with a series of lines, circles and patterns with different settings.
Or is everything a trial and error approach for finding what works best?
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On the other note I did manage to find a rubber eraser at Meijers that burns well to make rubber stamps,
Comes in a pack of 5 for a dollar. 50mm x 20mm.
(And they are thick enough you could use a thin scroll cut saw blade and cut them in half & double your investment)
They are called "Eraser Gomme" Cleaned them with Water, Citric base Orange spray and a tooth brush.
Use spray contact adhesive and a piece of wood for a handle and support.
Also buying scrap or damaged luan sheets at the Big Box store and cutting them to size.
(I cut about 200mm square)
Then using an orbital sander, I quickly sand and then stain them first before burning, find they work great for outlining and shallow engraving. (I can not burn thru 1/4" of material; as of yet) I then Clear Coat them and they are ready to go. Or I route out an opening and inset them in a table top and then they can be coated with the plastic thick clear epoxy.
Happy burning.