Strange pulsating render artifacting

I am getting a strange pulsating render artefacting that I am struggling to get rid of. Roughly every 25 frames in a 25 fps render. I am using the Vimeo HD 1080p 25 render preset though it doesn't go away if I change it to other presets. The Premier Pro file is reasonably complex and has several After Effects Comps in it which use high resolution still images, where the pulsating artefacting seems to be worse. I am using Adobe Media Encoder to render.
MacPro (mid 2010 model) ATI Radeon HD 5770 1024 MB graphics card, SSD hard drives. 24MB RAM, Mac OS 10.9.3
Any ideas?
Artefact pulsating is most noticeable in the foreground in this example

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