Rendering with Yafaray, 4 incorrect frames

I am having difficulties rendering out a piece of an animation.
I am using the Blender internal renderer for the color/spec/diffuse/shadow passes and Yafaray for the AO pass. The blender render worked fine and so did the yafaray AO pass. Except for 4 frames. The animation is 395 frames long and frames 227-230 randomly rendered out as static while all of the other frames rendered properly. I have tried re-rendering these frames and I’m getting the same result. Any ideas?


Anyone? These 4 frames are all that stand between me and a finished short! =(

The render of the 4 frames is this noise picture, or the frame 227 duplicated 4 times?