'Glowing' prim selection

Since today, I suddenly discovered that everything I select starts to glow, or radiate, the light coming from the coloured lines when selecting a prim.

Now I wonder how I did this - If this is either a bug, or a setting I managed to change (perhaps something in the new Debug options?)
Yesterday I was indeed trying to find a way to remove the yellow and blue lines you see when selecting an object using the debug menu, so I am not completely surprised if I forgot to put some kind of setting back, now resulting in this very beautiful sight:

http://labyrinth.kraakpiep.nl/Things/Glow%20Effect%20in%20SL.wmv

I'd prefer to know how to toggle or change this, rather then reinstall SL completely again. Cause it sure looks nice! XD

I see you already posted here where you got help! w00t!

/111/49/132474/1.html

Please don't double-post in here, it's redundant.