For maintaining rent ref in his site, admin implemented new method of renting ref. It should be at least 30 rent ref available, and then release them automatically. This is what you got when you try to rent ref if it is not reach 30 yet and one thing again, we could not transfer from main balance into rental balance. The reason is to maintain rent ref too. i think this is good decision from admin, and now people must to transfer money first from their paypal/alertpay into rental balance first before the can rent ref.