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I'm puzzled by your description. Clicking the select and mask button just opens the select and mask workspace. Nothing happens to masks until you click OK in that space.
Before clicking OK, though you need to choose your output settings (if they are not visible click the arrow next to "output settings") This will let you choose how to take the output
Many thanks for your reply and I have managed to deal with the problem. I must have inadvertently pressed a wrong button or clicked an icon erroneously but it jogged my memory as it has happened once before. I remembered seeing an icon at the top right of the screen that when clicked offered the ability to reset the tool. All now works as it should but the only thing that bugs me is what did I do in the first place!
Once again, thanks for your reply
You're welcome - glad you got it sorted