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Re: layer filled with gradient: the thumbnail shows the gradient and the image is tra

This is odd.

I looked over your screen shots and I could not see any reason why your Gradient tool is not showing in the canvas or in the channels panel. All your settings seem to be correct.

Have you tried resetting your preferences?

This is how to reset your preferences in Photoshop: Press-and-hold Command-Option-Shift on a Mac or Ctrl-Alt-Shift on a PC, while you start Photoshop. As you start the program you will get a pop-up dialog asking you if you would like to delete the settings file. Deleting the file will create a new set of preferences from scratch.