So to set the scene, we are at a car show, showing our cars. The misses says to bring the camera if you want some pictures of birds, this hedge is teeming with life! Camera is a 7D with a Meike grip.
I have some custom setups so selected one, fire off a few shots, review, decide I want spot metering, press the button, nothing, press other buttons on the top, nothing. Still able to take picture, just locked in to settings. I know I'll use the Q menu, nope nothing except the DOF button and AF on working! Ok drop the main batteries, switch on to drain circuits press shutter button. Switch off batteries back in, power up, same thing. Switch off switch on battery grip, nothing changes. Great I need this in a couple of days! Check lock switch is not set to lock, though I think that only disables rear control wheel cycle the switch on the battery grip on and off a few times, all is back to normal, I breath a big sigh of relief.
So if all the buttons stop functioning and you have a grip, probably especially a third party grip this might help.
For once I'm not in need of help, just trying to give something back!