Quote - Actually it was a LOT darker.

And I used the Albany Nights HDRI AO lightset from Poser 7, so there weren't a lot of fill lights ;)

Now I just need to figure out WHY it was so dark...

Probably because there was something occluding the light.

IBL with indirect light will behave different than without - more realistic. Without indirect light, you can lock a figure in a closed box and it still will be light by IBL - completely unrealistic. If you packed a figure in a box and put it in that space where the IBL was taken, the figure would be completely in the dark. It would only get lit when you open the box and let light in. That's how it behaves when you turn on indirect light: light from an IBL will only reach surfaces that are in an open space where light from the environment can reach it.