I am the maintainer of biber, a backend for the latex biblatex system which is distributed using PAR::Packer. This works fine but regularly we get an error report from users that after a while using the tool, a particular file disappears from the cache and the cache has to be deleted and the binary unpacked again. I have never worked out why this is and it has been a problem for a few years, through many PP versions. You can see the general issue reported here:
http://tex.stackexchange.com/questions/140814/biblatex-biber-fails-with-a-strange-error-about-missing-recode-data-xml-file From what I have seen, when this file is missing, all of the .pm files in inc/ are missing too although I cannot reliably reproduce this. It is a very frequent error from many users on various platforms and I’d very much like to find out why it happens … PK -- Dr Philip Kime
