Hi Magnus,
Try a corner that's not 90°. Try a corner that's greater 120°
Try this, as it's close to waht I'm trying to get. make a 5 sided planar flat to start. it's about 36" X 40" with a the short part at about 4". See Picture.. Then try the sweep flange. The littel short section near that ~150° corner is where it fails. I can do it from a solid, but not a swept flange. As I've mentioned, anything over 90°, Creo seems to crap out / dosen't know what to do / can't figure out how to lay a bend radius..
