Hmmm...did you digitize the basting stitches in your software...are they built in to your machine...I agree with Monika...it does help to bring up the bobbin thread...but that does not sound like that is your problem. Is it specific to just one hoop or do you have this problem with the basting stitches in all your hoops...
It came with a design I bought a long time ago. I tried yesterday to modify it by increasing the density so that the stitches are closer together and shorter. That has helped, but why I don't know.
I had a similar problem with my Janome 350e. The thread would catch & break as it turned the right hand top corner of the basting stitch. After checking everything I found the plastic embroidery foot had split & the thread was catchng in that. It was quite hard to see.
When you baste your fabric onto backing paper you must bring your bobbin thread to the top ,hold you top thread and slowly turn your wheel to bring the bobbin thread up then hold both ends till it start stitching
I also have huge problems with basting stitches, as the first few stitches do not seem to 'catch' in the material - so it just unravels as it goes just leaving holes and no stitches. I have never got any basting stitches to work :(
Try deleting and then upload again,Or turn your machine off to "reboot" Sometimes this helps :)