Sometimes in Immersion or Strengthening I get big black panels appearing either side of my screen which last, like, a second then vanish. Sometimes they appear on top of the sentence on the screen. Is this Duolingo or my computer? I use Mozilla firefox.
My bad! I usually post an example, such as Windows7/Chrome. I forgot to. My computer laptop has a little blue sticker on it that says Windows 7, can you find anything with a number? The different versions of Window matter, I think. (I'm not part of tech, so, guessing on that part.)