I am currently working on the challenge in chapter 14 and duplicating the pearls using the option + cmd button combination and dragging the pearl to its new location.
However, when I let go of the keys and want to simply re-position the newly created pearl, it leaves a wireframe, e.g.:
Hi there, the wireframe represents the attached physics geometry. What you’re experiencing is a known “feature” - for some reason the attached physics does not update when the node is moved. To get a full refresh, you have to close Xcode and then re-open your project - the wireframe should then once again be with its node.
It ain’t pretty, but at least there is a work around, even if it’s extremely painful. Hopefully Apple resolves it with the next release.
