Members missing - Permissions?

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Hi There,

I've got an odd issue with the members page. When logged in as an Administrator the members page seems to work fine.

I've created a separate group (Admin) with some stripped down permissions (using the Advanced Permissions Model). This user is able to add users, edit them, add groups etc and that all seems to work fine however, i have noted 2 things:

1) Certain members just don't show for this user. When searching for them it's as if they don't exist.
2) The number of pages does not show - It always just shows the page number of the current page + the previous and next buttons

I am using a workflow to manage user approvals. Has anyone else come across this? The version i'm using is 8.4.1 (which i will upgrade when i have a little time as the auto-upgrade feature appears to be broken for this version).