Resource pool- WILL NOT SAVE!!! LOSES ALL LINKS??

Hi guys

Master Project = PROJECT # 1, HOLIDAY, and OFF SITE VISITS

Individually, all of the resources have been set up to share resources in a file named 'resource pool'

when you view resource usage and all the files are open.... the resources are linked.

the Master project also reflects the resource sharing UNTIL you close the files!!! I save each file individually, then close the master. When I go to close resource pool, It doesnt matter if i press SAVE, SAVE AS or DONT SAVE AT ALL.... the links are somehow lost when it closes.... back to square one!!!

Any help greatly appreciated.... is this a bug or am I doing something wrong?

 

Thanks, Charli