I am experiencing the same situation; payout was supposed to happen at a much earlier date and numerous attempts to get more information all resulted in the same type of reply ("urgent prioriy", "case manager will contact you shortly"...). During some of the times I called, the CS person seemed to insinuate it this was an issue related to the guest's account (not his payment method though, they stated that clearly). The worst part is that this guest is now part of a current ongoing reservation and if there is some reason why Airbnb thinks I shouldn't be hosting them or they should not use their platform, then Airbnb never made contact with me about it and has left me all this time in the dark. The opaqueness and uncertainty regarding this cannot prevail while I am a current host or continue to host in the future; I can not allow strangers into my home not knowing and them having said to have already payed but Airbnb is not releasing the payout and at the same time things appearing as if this guest's account is under revision or perhaps already suspended (Am I supposed to wait for them much longer to finish "investigating" while the current reservation goes on and guest claims to have no clue, my calendar remains blocked, reservation shows as everything is normal?).
After reading comments on this thread and others I felt my best option was to file a complaint with the BBB last night. I hope this leads to a good outcome for everyone and that this was a just a "glitch" like the CS person on the phone seemed to suggest during one of my calls. I suggested I would be doing this via Twitter DM at the beginning of this week and decided to wait for the Case Manager to get back to me a bit longer, but yestarday I was convinced that "shortly" could end up being months like it was before for other hosts. I have hosted on and off at different properties since 2012 and never had I experienced such a thing from Airbnb. I was shocked to hear other hosts stories. I really did not want to add to the long list of complaints they already have at the BBB but I can not afford at this moment to have this payout on hold for indefinite time, less so to keep hosting with the uncertainty that I will be compensated in the way offered to me by them.
I noticed that the support on their website and at the Airbnbhelp twitter never replied when I told them what I had done last night (they are usually prompt in replying, so clearly they are advised against it when you show them complaint, at least privately). If I receive a decent response and resolution from them in the appropriate timeframe according to BBB, then I can assume that they are slowly improving their way of handling these issues with hosts. Assuming this issue does not become a frequent thing, I would understand if this was really just something very strange with the guest account and a hard to avoid exception (because if not then they clearly have problems handling the volume of issues and should not be suggesting inviting new hosts until they are capable of dealing with these problems in a prompt and timely manner).