For all you longarmers out there: I didn't don't there was a difference in needles. So inadvertently got some wrong ones. The scarf is flat on the front of the needle. They are embroidery needles. Who knew?
When I bought the LA the sales person said to always use the same brand of needles. Groz-Beckert. So I had a bunch of them from a previous LA. At one point I started using a pack of them. Everything was fine. Stitching was great. Tension was good.
It wasn't until I ran out and ordered some more that I found a problem. The new ones wouldn't stitch. So with a long discussion and many emailed pics the problem was determined. Now the timing is because of using the wrong needles.
I watched a video that made retiming appear simple. Perhaps for someone with better eyesight. I tried and failed.
Hopefully my DH will have a better time of it when he finally gets around to looking at it.
So make sure you're using the correct needles.