All If I leave my debian box on, I come in in the morning to find the screen displaying erratic debugging messages to do with pg_indexes and suchlike, with letters omitted, where I had left the login prompt. Logging into another console and typing "who" shows only the new console, tty2. Then I discover that the output display on tty2 has also become distorted, "halt" appears as "h lt" but works ok, e.g. What is this bizarre phenomenon; can I prevent it? Ta, jenny.