Confirmed here too.
There's also a problem if you delete one of the circular end-caps and then try to shell it from just the surfaces.
It seems that the inner band gets incorrectly formed into a kind of pinched end-cap.

All appears to work OK in v2.

Martin(2).

Hi Michael, that definitely looks like a bug - it looks like probably a bug in dealing with the trimming boundaries when doing the offset portion of the shell. Unfortunately there are quite a lot of bugs in shelling, I've been asking the people who make the geometry library that MoI uses to improve the solid offset function for quite a while now.

- Michael