Shadow error with highlighter

[seowen1]

I am having an issue using the highlighter function on objects in my scene. We are using dynamic lighting, including one point light with shadows turned on. Whenever we trigger the highlighter function on an object in the scene, it seems to have unusual shadow interactions.

I am currently unable to post screenshots - but basically we walk up to a monitor that is then highlighted with green (using the highlighter functionality) and shadows start to 'dance' across the model. It seems to be connected to the highlighter function somehow, because it only happens while highlighted - and it even seems synchronized with the 'pulsing' of the highlight. To confirm this, I disabled shadows from the point light and the issue no longer exists.

Is there anyone that has had this issue? We would like to use dynamic shadows in our scene, but this glitch is pretty distracting. Thanks!