If you have the condo in a separate window or tab and haven't refreshed it the old content will still show, but not if you have posted or refreshed since the board changed. I had the board list in a separate tab, got the notice on the new board and went back to Tess's tab and could copy then paste in a new post on the new board. I did lost the last few posts from yesterday as I had forgotten to copy the rest of the day, though.