PowerClip and CorelDRAW X5
Let's first talk about the default setting behind the confusion. Go to Tools | Options | Workspace | Edit and you'll find an option labeled "Auto-center PowerClip". In previous versions, it was checked by default and I felt it was the worst default setting in the program. Finally Corel left it unchecked in CorelDRAW X5 and it has caused confusion for all the users who didn't know the setting existed. If you want the old, flawed, behavior; just put a check in the box.
So why do I hate this default so much? In my workflow, I'll position an object exactly where I want it and then I'll PowerClip it into a shape. With the old default, my perfectly positioned object would move. It wasn't a problem for me, as I would change this crazy default to the correct unchecked setting. Other users just figured that's the way it worked and modified their workflow to adjust. This creates confusion for them as there as times the object "disappears" when PowerClipped. It didn't disappear, it just isn't visible since it it positioned outside the container object.
I think you'll find it better to adjust your workflow to positioning the object accurately that you'll find yourself more productive than changing the default back to auto-centering. Of course you can always post a comment and tell me why you prefer auto-centering.