[22:02 taylor] > pdflatex 61.tex                                                                 [/home/taylor/math/Math 4B]
This is pdfTeX, Version 3.1415926-1.40.11 (TeX Live 2010/Arch Linux)
 restricted \write18 enabled.
---! /home/taylor/.texlive/texmf-var/web2c/pdftex/pdflatex.fmt doesn't match pdftex.pool
(Fatal format file error; I'm stymied)