I was initially unable to OLCI for my flight back from GVA this evening. I think it must have been about 16:00 UK time for a 20:55 flight. Phoned BAEC (because the messages was of the scaremongering "better check your booking status" variety") who said that the airport hadpulled the flight from OLCI and that it should be available again within 45 minutes. And it was.

<wishful_thinking>
Maybe they took it offline for a time while they installed the patch that lets you go back and re-select seats?
</wishful_thinking>