I am obviously not a very experienced Photoshop user and I have a question about the Quick Selection tool. I am using CS6 on a Mac with OS X 10.9 Mavericks.
I watched a couple tutorials and my system is behaving differently. In the tutorials I watched, when the quick selection tool is chosen the "brush" contains a plus sign. If too much area is selected, that can be corrected by holding the option/alt key and this changes the brush to a minus sign. On my computer, when I select the tool the brush always contains a minus sign. I think the tool is working OK but I wonder why I never see the plus sign inside the brush.