Its probably too long after your message Michael, but if you have any ideas I'd be grateful! For two days I have tried to change a booking for May this year, just shortening by one day. So the orginal booking was paid for using Paypal. But now, the host having agreed the change, when I click accept on the new dates, there's a problem with Paypal. I think the screen said 'problem authorising Paypal'.
I've been using online support and telephoning both airbnb and Paypal -hours of time- but they each say its the other's fault. Totally stuck.
So basically, I can't get further than the change being agreed with my host. The refund page just doesn't complete because of this 'not authorised' message. Paypal on the phone confirm there's nothing wrong with my account, & it is authorised (I use it regularly). I'm in the UK.