Apparently this was some sort of really freaky pro glitch.
Solution: I deleted the radii made it square corners..& managed to save
the sketch.
I created a second sketch and started it with square corners and it
stayed in the new sketcher. (like it should) but if I went to edit the
first it was still the old sketcher.
I went back to my assembly to look at it again and one of the parts was
mysteriously missing. (I didn't delete anything, it was hidden when I
left the assembly, but when I went to unhide it, there was nothing to
unhide.)
So I exited pro updated the assembly and opened it all up again.
but my first sketch was now all screwed up. When I opened it, it was back
in the NEW sketcher but
had made all kinds of new assumptions and I had to do it all over. The
new sketch did not revert to
the old sketcher again.
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