One thing about those obj's struck me late last night: Could it be that IF you have disables File Compression (which is off by default, unlike previous versions) and do changes to the obj (which is likely an obz.. then Poser makes a new obj because it can't compress things into the obz with compression off?

I havent' tried it yet as I haven't had any new obj's pop up.. just a thought...

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.