Peter, I was wondering that. My great grandfather was a vet with a dairy in the dales in the late 1800s. My cousin has been researching the family history. I think I have solved the problem, it appears to be the laptop, I suspect it is low on resources and therefore is unable to run the transitions. I tried running the exe files on my desktop and they ran fine. Thanks for everyones help, time for a new laptop I think.