This fixing the broken photos from older post is really irritating.
I have to to go through each post, one post at a time, to see what is broken. Then I have to click on each broken image to open the Flickr page because that is where the URL for imbedding is located. Then I have to open the source code for each post, replace that URL with the new one from Flickr and finally save everything.
The bad thing is I’m still not sure what causes this. Hopefully I will figure this out in the next few days. At least you can still see the photo when you click on the broken image.