When you use the GP-3200 series, the ST-3200
series or the GP-4100 series, and in GP-Pro EX from the [System
Settings] window's [Font] page, in the [Font Used in Project] area
you clear the [Japanese Standard Font] check box, you cannot select
JAPANESE, which could have been selected as the top item for
OFFLINE LANGUAGE, and also cannot select other languages from the
combo box. The combo box is disabled and does not accept touch.
Refer to the following for [Font] settings on GP-Pro EX.
5.3.12 System Settings [Font]
Settings Guide