We had an issue where we tried to do a simple swept blend with 2 sections, each comprised of an arc, and a straight segment, though on each section the arc was on the opposite side. I other words, from one section to the next, either an arc segment would transition to a straight segment, or a straight segment would transition to an arc. When we tried to do it as a solid cut, inverted the sections so that it transitioned the arc to arc, and line to line, giving us a preview as if we'd had the start points reversed. We had to do it as a surface, then do a "solidify-cut" to make it work. Weird.
Anyone else see anomalies like this?