When I got Nokia E65 last year I faced with strange problem. After alarm was triggered the navigation buttons (including Own key were disabled). To make them work the phone should be restarted. Recently I found solution to solve that (thanks to forum on allnokia.ru). Using Tracker – advanced and fully customizable desktop application we reassign navigation buttons to the same actions. After that all buttons work correctly till Tracker is run.
Sure it isn’t a perfect solution but at least it works 🙂