hold CTRl-ALT-SHIFT (sorry not familiar with mac to give you those options) when starting photoshop. This will clear your preferences.
ALso there should be a lock next to the text if its a closed lock click it.
Hi, I'm having a similar issue but the crtl + alt + shift thing doesn't seem to be working... I do it right when I click the photoshop icon, but nothing happens.
I've been working on this painting for hours and then just...suddenly the color dynamics were locked. Not the kind of locked that you can just click and unlock, but permanently faded. The transfer section only has one portion available to modify, but everything else is faded. Wuuuuuuut.