Bugzilla optimizes database lookups by storing all relatively + static information in the + versioncache file, located in the + data/ + subdirectory under your installation directory.
If you make a change to the structural data in your database (the + versions table for example), or to the + "constants" + + encoded in defparams.pl, you will need to remove + the cached content from the data directory (by doing a + "rm data/versioncache" + + ), or your changes won't show up.
versioncache + gets automatically regenerated whenever it's more than + an hour old, so Bugzilla will eventually notice your changes by itself, + but generally you want it to notice right away, so that you can test + things.