I am the super admin and am unable to delete any Leads, contacts, quotes or invoices.

The delete button seems to not work.

I tried to change one of the users settings by setting it so that they CANNOT delete any of the mentioned fields. When this was done, a message popped up explaining that they do not have permission.

When I gave them permission to delete, the delete button seems to be no working or not responding again.

Any help on this?