I just got a Macbook air for Christmas and have recently downloaded lightroom 5.7. When I went to edit my photos the adjustment brush was acting funny. In lightroom 4 i could place the brush anywhere on the image and adjust to my liking but now i can only seem to get the adjustment brush to work/show up if i place it in the corner of the picture and drag it along the photo. When i put my mouse in the middle of the picture (where i want to adjust) i get the curser image but when i move my mouse to a corner of the image the adjustment module shows up. What am i doing wrong? Did i click on something i shouldn't have?