I was looking at the various polymorph subschool spells, and I noticed that Baleful Polymorph has this interesting bit:
Any polymorph effects on the target are automatically dispelled when a target fails to resist the effects of baleful polymorph, and as long as baleful polymorph remains in effect, the target cannot use other polymorph spells or effects to assume a new form.
(Emphasis mine.)
So would this mean that Polymorph Any Object would automatically be dispelled if the affected target failed the save on Baleful Polymorph (either on purpose or not)?
Personally, I think this would make it a bit overpowered, because even True Form a level 4 spell A) has a limited duration and B) has to overcome a DC = 11 + caster level of the effect.