I'll tell you this. Trimble is not getting the money for Pro out of me until it's 64 bit and multithreading. I am sure I am not alone. Let the market decide if it's quicker and let us find out for ourselves if it will quit crashing on humongous projects instead of feeding us all the reasons it won't be. I'm tired of the thing crashing during every thea render and I don't want to break my projects up into pieces old technology can handle, and I'm tired of excuses, and I'm really tired of script writers who don't want to rewrite their scripts for 64 bit. If music and video programs can do it and Thea Render could do it, sketchup can certainly do it. If not for performance, for mere market appeal.

I'm a newbie, so I might be way off the mark here.

Is it really a glitch? Doesn't it only happen when you chart a path through walls and objects? And as the walls don't have any ceilings (at least mine don't) the sun comes shining through while you're in the wall or in the object?

If that's the case, then more precisely plotting the walk-through might get rid of it. If not, then this info might help the programmers figure out how to fix it. With some sort of "smoothing" algorithm that doesn't compute the shadows for every frame and if there are any jumps in the values, interpolates from the earlier and previous shadow information to achieve the right shadows for the errant frames.

Just some thoughts...