Susume Lv 1
When pulling a segment with a cutpoint, the only direction it will move is toward its cut neighbor, to turn the cut yellow, even though cut bands are disabled and are not supposed to be pulling.
Puzzle 838, shared solution "838 s1 before banding" with scientists. Segs 100 and 101 are marked with gray bands. Disable cut bands, and try to pull either of those segs away from the other. The only way either one will move, regardless which way you pull, is to jump to where the cut turns yellow. The same is true of segs 157/158 and 127/128 - the only way they would move when tugged was together, turning the cuts yellow, even though I had cut bands disabled. Now they can't be tugged apart to move them to a new position.
Win 7 64, devprev (Jan 27 production release of newchapter)