I posted this question over on the DAZ Poser forum a couple of weeks ago as Anybody recall the Poser fix to get Freak 4 working without that dent in his biceps ? because the Renderosity forums weren't working.

Kerya pointed me at Lyrra Madrill's Michael 4 arm fix freebie on ShareCG which does indeed fix the problem.

But what I'm actually after is the explanation, which I'm fairly sure that I read in a thread here on the Renderosity* forums.

I've used both Renderosity's own forum search and Google to try and find the thread, but with no luck.

Does anybody have the link ?

*it could have been the RDNA forums

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

Answered over on the equivalent DAZ Poser forum thread there.

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

I know you have found your answer but in case anyone else is interested, I think this may have been what you were after here. Not an explanation of why it happened, but shows the fix needed.

https://www.renderosity.com/rr/mod/forumpro/?thread_id=2855184