well
it simply will not render past that frame.  There is a line of white at the top of the frame above the sky. It stops there and will not progress any further.  The rest of the image renders, but one cpu hangs there on that line so it never finishes.

As an attempt to work around this, Im going to make the camera point downwards faster so as to avoid that line of "infinity", therefore always pointing at the replicated city block objects.  

Carrara is max-ing out the cpu, then it runs about 5 minutes then it passes it to another cpu and then that one will run..and so on and so forth.

While making this tho I have a suggestion to improve the replicator.  That being, a set degree of rotation for a replicated object.  The problem with city blocks is that eventually you see a pattern.  If the replicator would allow you to set 90 degree increments as a rotate factor that would be assigned randomly to each block, it would align properly and no pattern would exist as each one would be randomly rotated between 90, 180, 270 and 0 degrees.

:)
back to the drawing...err..render board.

BT