This is the information i can get around the problem, hope it helps.
Taken from: http://kb.netgear.com/app/answers/detail/a_id/23568/
I have enabled a wireless MAC filter (wireless access control) on my router. What should I do when installing the extender?
The wireless device MAC address is translated to another MAC address when the wireless device connects to the extender. To allow the wireless device to connect, you must add the translated MAC address into the router.
To get the translated MAC address:
1. Disable the MAC filter on your router.
2. Power on the extender and connect all of your wireless devices to the extender.
3. Make sure that the Link Rate LED remains lit.
4. Log in to your router and check the attached devices on the Attached Devices screen. Add any MAC addresses that begin with 02:0F:B5 into your router’s MAC filter table.