Updates in Assembly do not take place in existing motion study when saved

Maybe it's just me, but after updating my assembly the updates don't seem to happen in the motion study that I have created previously. I can see the nuts and bolts there but when I save as an AVI i cant see the new hardware that I've just added in the video. This happens for both exploded animations and moving linear animations. Some of the animations are complex and a pain to setup again to see these updates. Is this a bug with SolidWorks or is there a way around this?

Cheers,

Ray

SolidworksMotion Studies