Here's an example ^^^^^ Normally, theese things aren't a problem, except when they happen on  group seam. Then Poser shading seems to go bezerk. I just had an issue likt that happen on tyhe outfit I'm making, and had me puzzled for a while. Where shading didn't respond to normals. Everything looked like it was supposed to be, but still the artifact was showing. Once I unwelded the three-way, and separated it by a tiny bit so poser doesn't weld it on import, the shading glitch went away.

Hi, my namez: "NO, Bad Kitteh, NO!"  Whaz yurs?
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