Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8F190 Safari/6533.18.5)
Ok, the answer from Apple is this - delete any alarms set, update to 4.3.1 and then re-set your alarms. I totally appreciate that this doesn't help at all if you run a JB iPhone or if you don't want to update for some reason, but that is the fix. Hope it helps