I see some people have this problem, but don't found way to fix it. I post here how to repair it.
1. Delete C:/Documents and Settings/username/Application Data/RadiantSettings/1.5.0/trem.game/local.pref.
2. (if first don't repaired) Reset all GFX Card settings to default.
3. Run GtkRadiant and set all settings, because old was deleted.
Post here if this helped.
GtkRadiant does have an option to clean all preferences on startup if this occurs.
You seem to have supplied instructions only for Windows.
Quote from: Bomb on July 18, 2008, 09:16:54 PM
You seem to have supplied instructions only for Windows.
It's only happened for me on Windows, never Linux.