[GavinKM]

Thanks for the reply. There are no locks on any dates but the first task does not pull back to start at the new project start date. I exported the whole thing into MS Project and changed the project start date and the tasks fell into line without a problem so it looks it's a bug. I would send you the file but the tasks are for a specific business project so if I get time over the next day or two I will rename these tasks and send it off to you. Thanks for your help.

Gavin