Agh, Dock problem.

[Radio Monk33]

Hey guys, just a quickie:

Uh I seemed to have lost that blue indicator for active programs. Now I see nothing. Is there something that I have to toggle in preferences?

 

[HLdan]

Open the Terminal and try this command.
killall Dock

 

[Radio Monk33]

Open the Terminal and try this command.
killall Dock

That did it. Many thanks, Mac master!