Here is another example of multiple replicated trees with wind: Click here (MP4 format - 640K)

I still think that C5 (especially with trees) has memory issues.  In my previous post, I mentioned that the render did not fully complete and the memory useage went sky high.  Even after the render was complete and saved, my entire system memory useage was still high even though the Task Manager in Windows said C5 was using only 12MB.  When I close C5 completely, the memory useage drops back to normal (in this case from 950MB to 220MB)

Anyway, this rendered the first 124 frames of 150 before failing.  So I just ran it again and rendered frames 125 to 150 then combined the 2 files in my video editing program.