Hey i'm having the same problem and i'm also having a load of others! I wrote a post about an hour ago asking for help because I couldn't book any property even though I was sure my dates were valid, I also couldn't do another search as it just put me in a loop. After changing browsers from chrome to safari though it seemed to work fine - search worked and all the properties were available for my dates with the pricing shown all correct. So I just wrote a really long message to a host asking them a few questions but when I went to send it said my dates were invalid - same as you there is no problem when I enter them, they are shown as available but the message will not send 😞
Please does anyone know how I can alert airbnb to the problems i'm having or how to fix them..?