Can you post a screenshot of the whole desktop.
The obvious is the alpha lock in the layers dock, however not easy to set that accidentally. Other than that don't know.
There are other ways to fill a selection, click-n-drag from the FG/BG colour swatch works so does click-n-drag from the patterns dock.
The obvious is the alpha lock in the layers dock, however not easy to set that accidentally. Other than that don't know.
There are other ways to fill a selection, click-n-drag from the FG/BG colour swatch works so does click-n-drag from the patterns dock.