I’m having a similar problem. I did an animation with Invig Pro 4.5.1p in AE 9.0.3 using AE’s lights. I updated to the latest version of Invig Pro 5.0.4 – opened the project with the new plugin – did a Ram preview, which worked fine – but when I went to render, AE simply sat there. (This happened on both a 2010 generation MacBook Pro 17″ with 8 gigs of Ram and on a first generation Mac Pro with 12 gigs of Ram.)
I reinstalled 4.5.1p on the Mac Pro and it’s rendering away. The MacBook Pro with Invig Pro 5.0.4 still crashes if I attempt to render the original project – whether I remove all the AE lights and turn Comp Lights off, or not.
BTW – love the new interface… I think. 🙂