Hi, I have a strange situation. I'm using Photoshop CS and have been using it for years. Now, SUDDENLY, after all this time, when I use the Move tool to move a layer, whatever layer I'm on, Photoshop selects a different layer instead, typically the background. If I use the arrow keys to move it it moves the right layer. With the mouse, the selected layer usually (!) changes to some lower layer.

Like I said, it has worked fine for several years. Maybe I clicked something somewhere by mistake? This has been happening for a few weeks now it it's really annoying. Any thoughts??

By the way I'm using Mac OS X 10.4.11, and haven't installed anything new recently... Thanks for your help.