Hi, I’m not getting the errors that you are, but the Update feature doesn’t work on mine, either. I suspect that the reason why you couldn’t delete points is because you have the actual pattern under Detail and that should also be deleted before trying to delete nodes.
However, by editing the points A16 and A17, I think I’ve managed to get it to resize very nicely if you change the measurements.
I opened the options of A16 and change the degrees to 0, the axis point to A10 and the line from A2 to A3.
This way, when A3 moves, that point will move with it.
I did the same for the other side.
Here is your pattern back with the changes so that you can see what I did: Panty a.val (10.2 KB)