Magic trackpad hangs on user switching

I have found that Mountan Lion 10.8 seems to have largely fixed these problems for me. My wife and I have ceased worrying about whether iPhoto is left open or not on either of our profiles, and the problem has yet to rear its head.

The next step is to again try enabling "allow bluetooth devices to wake computer" to see if that's now fixed, too.

I'm having the same issue on Mountain Lion 10.8.2. I do not have iPhoto, for me simply clicking "Switch Account" from the lock screen causes the Magic Trackpad to stop tracking. I have plugged in another USB mouse so I can post this reply, the weird thing is if I click my Magic Trackpad, I can click just fine, so it isn't like the Trackpad lost connection, I just can't move the mouse cursor 😟 - This is very annoying and forces me to have to reboot every time this happens.

Any solution?

I pretty much don't have the problem at all anymore on Mountain Lion, regardless of whether iPhoto is open or not.

But, I still have Bluetooth devices can wake computer turned off in settings. I'm just so happy to not have the problem anymore, that I don't want to press my luck and cause the problem again.

Have you tried to click "Switch User" from the lock screen? - I mean if your screensaver is on and it's set to ask for password, there is an option to "Switch User", when I click that, my magic trackpad stops tracking, i.e. I cannot move the mouse cursor 😟

I have the Bluetooth devices can wake computer turned off also.