Unable to change LineStyle

Hello All...  once in a drawing I add a new layer (or highlight existing) and choose my layer settings by clicking in the column for Style and Thickness.

The thickness displays a list of values to choose from.  Clicking in the Style Column does nothing....no list.   I am in 2011 SP4 on XP pro x64

Has anyone ran across this issue and if so, how to fix it?

Thanks

SolidworksDrawings And Detailing