For no particular reason that I could identify, I was faced with the impossibility to compile any latex document and invariably got this error message each time I tried :
LaTeX: problems after [0] pages
kpathsea: Running mktexfmt pdflatex.fmt
tcfmgr: config file `tcfmgr.map' (usually in $TEXMFMAIN/texconfig) not found.
I can't find the format file `pdflatex.fmt'!