TeX now vs. Tex in legacy version

[Fergus]

1. Currently, having recently upgraded, I can't use latex:
$ latex a8.tex
This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Cygwin)
  restricted \write18 enabled.
---! /var/lib/texmf/web2c/pdftex/latex.fmt doesn't match pdftex.pool
(Fatal format file error; I'm stymied)
$
but I guess everybody in similarly situated.

2. I reverted to good old Cygwin Legacy. The command
$ latex a8.tex
works just fine and creates a8.dvi.
But - am I going crazy? - the command
$ xdvi a8.dvi
bash: xdvi: command not found
doesn't seem to exist. From memory I used it day after day, all those 
years ago. Have I mis-remembered? There's no entry in 
/etc/setup/installed.db. Don't want to have to re-install, and if so, 
what package? There's no xdvi under release-legacy/.

Thank you, sorry for mind gaps,
Fergus

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