T50-W: cannot edit or remove VPN users
we own a Firebox T50-W with version 12.3.1.B585922 and currently we're not able to edit or delete VPN users under Authentication > Users and Groups menu item.
We can add users but when we try to delete or edit them "Edit" and "Remove" buttons are disabled.
Under Authentication > Servers Firebox DB shows 0 users while we have way more than that.
Is there anything we can do about this problem?