Last night ~11PM I held 3 reservations (2 via the 'pay with cash' and 1 held using a travel voucher). I went on ~630PM tonight to confirm/pay for them and none were on my reservation page, although they all said that they would be held until midnight tonight (~25 hrs).

I called CO.com support and explained the issue. The lady said that, although the website says they are held until midnight, they are only held until 5PM. With a lot of work, she was able to re-instate them, but told me that in the future they will not do this, and that I was lucky she was able to on these reservations (2 of the 3 the fare was no longer available online, or I would have just re-booked them via co.com).

Is this a known bug? I'll report it to CO.com so that it is tracked, but it's just annoying that I had to spend 2 hours on the phone while they re-worked my itineraries that should have been saved another 5 hours.