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I have this intermittent problem with Bluetooth devices on my MacBook Pro.
Even with a fresh set of batteries, occasionally my MacBook pro just seems to "lose" one or the other of them. The Bluetooth preferences says they are still connected, but the computer is not processing any input from them. If I disconnect a malfunctioning device from the preferences tab and reconnect from the preferences tab it always starts working, but if I turn the device off and back on it never starts working.
1Happens to me too, Apple bluetooth keyboard input stops being accepted, even though it is still "connected". This happens with most of our office (we all have MBP+Apple wireless keyboards). – jtimberman – 2009-08-04T00:14:44.573