Booked GRX-MAD-LHR as a single ticket on ib.com some time ago, got an eticket receipt from Iberia same day (why can't Ba manage that?) and all fine in mmb. Go to check in for flight tomorrow and get advised by ib.com that online checkin not possible - look in mmb again and now the grx-mad segment has no eticket number against it. The Mad-lhr leg still has the 075 ticket against it. Travelling with family and slightly concerned- anything I can do beyond getting to grx early tomorrow?

[and echoing luckyjim above, why does this only happen when travelling with family??]