Hi,

When I render out a sequnce something goes wrong on some frames. Cannot tell what exactly, but those frames are not rendering properly which leads to flickering:

https://vimeo.com/105435789 [vimeo.com]

this is how one of those false frames looks like:

http://i.imgur.com/IUjFUxP.jpg [i.imgur.com]

what can cause this kind of behavior?

P.S. attached a file