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I didn't use Alt Backspace, but I found once I locked the transparent pixels and THEN used the paint bucket tool, that seemed to work. Thanks.
The paintbucket tool is one of those tools that were originally conceived just to fill out the toolbar. It's just a magic wand followed by an automatic fill with foreground color. You don't need a dedicated tool for that.
But like everything in Photoshop - once there, it never goes away.
You need to think in more flexible terms. Select then fill is what you need here. For the first part there are zillions of options available that are much better than the magic wand.