AloisMahdal opened the ticket and wrote:

Town name sets can sometimes disappear from the drop-down list in
"Game Options", even after the NewGRF has been activated. This
can be observed right after the game is started, the NewGRF being
activated in previous session.

As a workaround, to make the sets appear on the list again, it's
enough to re-visit the NewGRF Settings dialog (no need to re-activate
the NewGRF file).

STR:

1. Remove/rename ~/.openttd
2. Run openttd (allow auto-download
   basic GRFs if asked on startup)
3. Download relevant NewGRF using in-game downloader
4. Activate names' NewGRF in "NewGRF Settings" dialog
5. Go to "Game Options" and check that new sets appear on the list
6. Quit the game and start it again
7. Go to "Game Options" and review the name set list. You should see
   that the new sets are missing.

If, instead of just checking the list, one of sets is actually selected
in the step 5, opening dialog in step 7 reveals that "undefined string"
placeholder is selected where the name would be expected. In such case,
however, the bug does not seem to have direct effect on gameplay--map
would be created with correct names.

The bug was observed on Debian Jessie amd64, with two NewGRFs (did
not test other ones):

* Japan Set Town Names (ID: 45520C00, adds one set called "Japanese")
japanese_town_names.0.6/jpset_namw.grf

* Japanese City Names (ID: 736C6602,filename `japanese_city_names-1
/jpcities.grf`, adds three sets, "Japanese (English)", "Japanese
(Hiragana)" and "Japanese (Kanji)")

The bug appears in currently latest version 1.3.3-RC2, as well as version
from official Jessie repos (1.3.2-1).

Attachments

• jpnames.png (210.82 KiB)

Reported version: 1.3.3-RC2
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/5819