Fatal Error with Radiosity Rendering?

[twiceroadsfool]

I set up a fairly simple interior rendering... Has some can lights in a soffit, 2 lights in the main ceiling, and the sun outside. It radiated fine...

Then i made a family of some window blinds (lovered) to go over the windows, and now when i click radiosity, it just fatal errors and crashes Revit.

Is it just too much for Revit? I have trouble believing that as some of you have rendered much more complex scenes than this... Any thoughts?

[twiceroadsfool]

Okay, i take that back, its not fatal erroring, its just making Revit close with no dialogue, no save, no anything...