The Manual Project moved servers a month or so ago but the pdf builder is still on the old server. Once I move it all pdfs will work again.
Looks like there was also a case sensitivity problem (Xbox vs XBox) which is fixed now. Unfortunately any Xbox manuals submitted over the past month or so were never saved, so please re-upload them.
To follow up on this, any Xbox manuals uploaded this last year cannot be viewed on Vimm at all and show up as "Error: Image not Found"