Just checked and whilst I can't upload anything new at present, the images I have on PB are intact and accessible.
Only started using PB when Tinypics went down a couple of weeks back. At that point I could upload but when I tried to access an image I got an error 404 message. Just checked TP and again my images are intact and accessible and I was able to upload a new image and access it.
All a but frustrating.