Hi! I've been using this Petporte for a couple of years and it's great! I accidentally deleted my cat's microchip from it yesterday...but have successfully reregistered him again. Unfortunately something seems to have gone wring with it as it remains permanently closed! Does anyone have one and could advise me? The manual doesn't seem to include this. I've tried setting it back to default. I've tried setting it to 'open mode', but nothing is making any difference and it remains closed! I would be glad if anyone had any ideas!...cat unimpressed!