Most of the bugs in Poser 4 really are "features". They are things that were badly thought out. The library structure is a good example. Probably it seemed like a good idea at the time, but whoever was working on it never imagined that anyone would collect hundreds of poses, MAT files, etc, that would bring the system to its knees. Many other features are also really just bad design (like the feeble undo support, the difficulty to duplicate props, and so many others) and not bugs. Irritating as these features are, I'm not sure that CL are obligated to fix them in the way that they might be with real programming errors.