Vertical Ruler options:

1) Settings --> Enviroment --> Edior: Vertical Ruler Enabled: Set to On / Language Dependend
2) If "On": Please set the settings according to settings-->enviroment-->editor
3) If "Off" you'll never see the ruler
4) If "Language Depenended": Go To 3DGamestuio-->Litec Settings & Colors --> Extra --> Vertical Ruler Enabled = On.

PS: Probably "Language Dependent" is the better default value.