I have this problem when rendering solidworks animations using Photoview where the camera completely goes crazy!
I set up my animation and let it render and when it has finished and i view the final footage, the camera zooms off into the background away from the specified view I have set for it. Sometimes it moves into the background then the camera view I set just appears then disappears.
I havent had this problem with small parts, its usually with large assemblies which is what im currently doing a lot of.
Sorry for the plea's of desperation!