noob1 wrote:
OK I figured it out... I needed to go to Layer > Stack > Select Next Layer (twice) and that fixed it.
If someone could please tell me how to mark this issue as resolved (with the green checkmark I suppose) I'ld appreciate it... thanks
Much better to open the layers list (Ctrl-L) and directly click on the layer you want to paint on.
Also, when nothing happens, you could be painting on something else that you don't see (covered layer, channel...) so you may want to do some undo to get back to before your first paint attempts...