1st pic: after sweeping, one end of tube is not horizontal. I tried a few times and apparently I can do that by adjusting the curve. Is there any guidelines to make it perfect?
2nd: No closed loop after rotating, which means I can’t extrude the face. I didn’t see the principle behind that. Two planars share the same axis that still make them independent faces. By zooming in, seperated points can be seen but it didn’t allow me to fix.
1st pic: We are implementing a new sweep function in the next release (Shapr3D 3.0). Sweep will work much better, and you won’t experience this anymore. Only a few more weeks left.
To fix this: I would need to see the the actual spine you used for this sweep to answer your question. Just by looking at the end result, there’s not much I can say on how to fix it.
2nd pic: I have a few questions to better understand the issue. Are you sure you rotated the sketch 180 degrees? Did you try mirroring it instead of rotating? It could be a bug for sure, but can’t tell only from the picture.