A note on V4 rigging issues: V4 uses a sort of magnet system in its default rigging. For standard characters and included morphs, these don't pose much of a problem. However, particularly around the breast and buttocks regions, these magnets can cause unusual deformations in custom characters and in characters with either extreme morphs or extreme contortions.

These deformer magnets can only be seen in the GUI if, under Display, submenu Defomers, if Show All is checked. They can then be edited in order to correct for custom morph/pose issues using the Joint Editor tool.

Also, customized deformer magnets can be setup using JCMs, straight out of the GUI in Poser. Using the Poser rigging tools and the custome Morph Brush, one can virtually reconstruct/morph V4 to suite one's needs without ever having to leave Poser. IF one is creating standard human figures using V4 as a base. If one wishes good custom "morphs" and the like, with very high degrees of accuracy, other tools are preferable in regards to topology work. (And, in some cases, direct editing of the .cr2 might be preferable.) (Note: These deformer magnets are part of what is transferred to clothing when "Magnetize V4" scripts are run from V4's Pose library.)

IOW - The figure is very versatile "as is" and for virtually every problem one could encounter, there is a solution that is available from within Poser. That does not mean, however, that the solution that is available will be the "best" one or the one that the user would prefer to use. (For instance, shvrdavid re-rigs V3, which is perfectly acceptable and would be for V4, just as some vendors have done, themselves, for their custom characters. (ie: GND, AS, etc..))

But, there ARE plenty of perfectly viable solutions available, right out of the box, for characters rigged using Poser's default rigging scheme.