I have a library to which users from different trees need access.
I've created a distribution list where I added all the users and gave the the appropriate rights. No public rights have been set.

The distributions list does not seem to apply the rights for users outside our
tree and domain. However, if I add the user individually it works just fine.

This problem also exists when users are granting rights to their documents. The distribution list doesn't work but individual rights do.

I have another (older) library where this approach work just fine.

What have I missed?