Quote - Where   is V4++Petite.obj ? Any idea what this could mean?

I have an idea about this, it may be right it may be wrong. I suspect that you did something that caused  internal geometry ("geomCustom") to be created in the figure, eg used the Grouping Tool to create a new group, or material zone. If you then saved the figure back to the library, Poser would write a new obj file for it incorperating the geomCustom , and use the same name for the obj that you used to save the figure. Saving the figure as "V4++Petite.cr2" would create a "V4++Petite.obj". The next part is a bit harder to understand, loading the "V4++Petite.cr2" should cause it to reference the "V4++Petite.obj", unless either the obj file or the cr2 have been moved since they were saved.