Very strange indeed. The fuckery occurred on Tuesday July 31st. I believe the following day I uploaded an image here and downloaded it the following day, and it was unchanged from the OG (still had PK header – missing JIFF). The following days I downloaded an image that I had uploaded prior to the 'fuckery', and it had the JIFF header (and wasn't a PK file). I just downloaded the same image now, and it's been restored and is the same as the one I uploaded prior to the 'fuckery' on July 31st.
Hard to know if all the files have returned to the originals, maybe some of the F5 files that had important messages were never restored.
I think we should work on a distributed BF tool, would be great if it could be done is JS, so we can have people just visit a website and have it go. There is a f5 JS stego, but it's not compatible with this one, but perhaps it could be altered to be compatible.