There are some obvious changes with 737 and I suspect that some are not intended.

Pre 737, I had been working up a procedure to form "cut" threads on a bolt shank (cylinder) by doing a one-rail sweep of a thread profile along a helix. If the thread profile vertical line was => the helix pitch, I got the "self-intersecting" error. I ultimately solved my issue by cutting the thread profile into two sections.

Now, after 737, I find that I can sweep the helix with a profile whose vertical dimension exceeds the pitch without getting the "self-intersecting" error! Great. However, when I now subtract the swept object from a cylinder and go to the wireframe display mode, the wireframe elements that represent the crest (outer diameter) threads no longer display. The solid thread model displays correctly as do the hidden line modes. I also changed the model to a mesh and all the facets seemed to display properly.

I am assuming that the data base contains all the necessary model data, but that something is preventing the wire frame from displaying properly.

I rather like the fact that the "self-intersecting" error has disappeared, but I suspect that it was not supposed to disappear.

Here is a file of my thread-cutting method. I hope it contains the info you need