Can’t Enable Wireless on DI624 Router

Just updated my DLink DI-624 rev C firmware to ver 2.75. Almost everything works except I can no longer turn on the wireless, disable the SSID broadcast or alter the security protocol. The “Accept” button just doesn’t response on the Configuration Menu’s Home > Wireless page.

I sumbitted the problem to DLink via e-mail but no response. Do I wait for them, revert to an older rev or am I doing something else wrong?