Empty, but unuseable space in LG Ally??

I'd like to know why I can't load any more apps onto the Ally when; I have all settings loading all possible apps to the SD ext partition (800 or so MB), have about 115 apps or so loaded, only a few on Internal, and nearly 100 MB left on Internal? I don't think I've come close to maxing out the Ext, nor why can't I use the huge chunk of Internal -as reported by TiBu, by the way-? ?? Running Velocity 12 ROM

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