Hi there,if any Bugaboo Bee owners could help me I'd be very grateful. I just bought a Bee secondhand for my 3 month old to replace my tank of a Silver Cross travel system. I'm really pleased with it except the Seat extender - the part you sit on - seems to be stuck. I can't pull it out at all. I've taken the seat fabric off and can't see anything amiss, has anyone experienced this or have any idea how I can resolve it? I'm using the baby cocoon with it and need the extra length in the seat. Thanks very much!