We've run out of space on PDC, so some of our new staff have been created on an established secondary DC, it should have contiguous GP but we have some problems. We have random permission issues, and some daft things like people not being able to to add other mail boxes. Historically all of our staff are on the PDC and then the students are spread over 3 other DC's and as far as we know there are no problems with them.

Any ideas?