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I also like the idea of resetting your tool and/or resetting Photoshop Preferences.  However, it would be good to verify exactly what you are doing step by step.   You mention "when in selection masking space" and now I am not sure if you are creating a regular selection  (with the marching ants over pixels) or if you are using the selection tool to modify a Layer Mask, etc.  Debugging and providing better recommendations are best done when it is very clear on the actions your are taking and what is meant by "but the tool still does not work."   I am sure it is very clear to you yet just keep in mind that when all we are doing is reading your text, we are blind relative to what you see on your screen.

Just a suggestion.

John Wheeler