Having the same experience. What a nightmare. Transferred 110,000 points from CapitalOne to FlyingBlue on Friday instantly. Got Cap 1 email confirmation at the same time. Went to transfer 326,000 exact same way a few hours later. No Cap 1 confirmation email, website looked like they transfered (they were debited from my account but no status showing pending or successful anywhere), it's now Tuesday afternoon and still nowhere to be found. Cap 1 hours and hours on the phone saying there's no security issue and they cannot do anything until they haven't shown up for 15 days (what a joke). AirFrance tells me this is a common issue with CapitalOne and went as far as to say it doesn't happen frequently with other cards. CapitalOne wants to take no responsibility. They made me open a case and the case manager called right away saying that they're sorry and since on their end the transfer was successful, we just have to wait 15 days. They will either show up in the Flying Blue account or after 15 days I have to call back and then they will investigate putting them back into CapitalOne. Needless to say, never spending another dollar on a CapitalOne card.

If anyone has any ideas, please let me know. I am going to wait another day (since I have the flight on hold until end of day tomorrow) and then transfer in Chase points instantly. If the Cap 1 points end up showing up I at least have 2 years to use them.