The top image is the section view, and appears properly. In the detail view below, you can see the threaded rods, which are behind the view, and an o-ring which isn't getting sectioned.
CTRL-B makes the o-ring better, but not right. CTRL-Q changes it back to tthe image above.
I'm reporting this to my VAR (we'll see how that goes) but I didn't know if anyone here had a workaround.