Ah, just checked it with M4.

If you accidentally move the origin in the hip, it will behave precisely as you describe.

To get it back, check "display origin" and "animatable origin".

Look for the green x.

Find the parameters in the hip called yoffset, xoffset, and z offset -- or something like that. Or they might be called OriginX, OriginY, OriginZ. You'll know they are the right ones because when you change the dials, the green x will move. If it doesn't, then they're not the right ones (and prolly shouldn't be adjusted like this). They might be hidden, so you have to go to "show hidden parameters" to see them. Anyway, move the dials until the green x is centered on the hip. If you go into the joint editor, you can also just drag it into place.

Then uncheck that "animatable origin". That should (I'd think) stop it from being moved -- though I can't think what moved it in the first place.

---

PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.