Fill not working in Photoshop CC - Windows 7
Suddenly having an issue where the "Fill" command is not working. It doesn't matter if I use Shift+Backspace or Shift+F5 or by going to Edit>Fill. It goes through the motions and the Fill action is recorded in the history panel, but the layer is not filled. The only way I've successfully filled is with the Paint Bucket, and that's just not as convenient.
Screenshot:

System details:
Windows 7 Professional x64 Service Pack 1
Photoshop CC 14.0 x64
Any help is greatly appreciated!
Thanks.
