Paris Hilton♥:
V gimpu nedělám, ale tohle jsem pro Tebe našel na netu:

I had a lot of trouble with fonts. Everywhere I looked on the net I found instructions on how fonts could be added to the Gimp menu and I couldn’t make any of them work. My final solution was:

a – make sure every font I wanted was loaded into my Windows font folder;
b – uninstall Gimp and the GTK Runtime Environment which it requires;
c – reload the latest versions of each
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Podle mně máš problém v první části - buď nemáš fonty řádně nainstalované (tedy nejsou v adresáři %windir%/fonts
a nebo nejsou natažené --> restart