I realize your post is quite old. On the off chance you still own your 10001, I may be able to help solve your dilemma. I’ve owned the same machine for 15yrs and use it nearly daily. To complicate further, I use Mac computers. Using Embrilliance, I download designs onto my Mac and save as a .Jef. I make any alterations needed and save to a photo card. I insert the photo card into my 10001 and ready to stitch. Yes, I often receive a warning message on my Janome stitch screen however, it’s a PC. I click cancel, sometimes repeatedly. Eventually, the machine accepts the design and stitches perfectly.
Hope this helps. Perhaps I’m too frugal, My Janome works like a champ and I refuse to replace as long as she’s working well, even if it takes a few adaptations.