Around letters. Font used is Times New Roman, 30pt, Bold. Note that it seems to show up only if text is modified in runtime, i.e. “typewriter” effect. When you change text in editor and you have text object which you changing in scene, you’ll see it too.
nVidia GeForce 9600GT (I have proprietary drivers installed) & scratch what I said about it coming out when modifying text. It seems to happen at random as I recompiled game and now it’s gone.