Michael
I hope this makes sense and is helpful.

With Straght Snap ON
Get 3 things as drawing a line; variations--- tag "On Srf"; and/orTag "Normal, and/or construction lines
Special note. However, if I draw a series of lines separately, one after another, there are variations between each. Some are "twisted", some are "flat".

With Straight Snap OFF.
Consistently only the "On Srf" tag. Flat.
Doing repeat lines still all flat.

Think that clarifies that a gremlin is involved I think?

Thanks for the temporary solution.

Brian