OK, I'm a senior but I'm usually smarter than this LOL. Anyway, I'm having some flaky issues with the magic wand tool in PS CS4 on my mac. Been great for well over a year, but all of a sudden I'm having problems isolating any areas in image files, and I'm even talking about strong difference ones like text on a sky background. I go to use the magic wand to capture the text (like a logo), and no matter what my settings are numerically... it just selects the whole picture. Could I have possibly tripped some preference setting that is obscure?

Tell me what I need to do to fix this. And of course... thanks in advance for any/all help on this!