I don't see this behavior on Windows 7. The Develop Loupe Window stays the same size and aspect ratio (1x1), but image area outside the crop does appear when using -Scale or + Aspect settings. LR CC 2015.12 behaves the same. Both landscape and portrait images behave the same.
Perhaps you're seeing something else?
i guess I was wrongly expecting and rembering a different behavior.
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Bob, if you check 'Constrain Crop' in the Transform panel the scaled image should fill the 1:1 crop frame. You can then use the X Offset and Y Offset controls to reposition the image inside the 1:1 crop frame. When using the Transform panel I generally leave Constrain Crop unchecked. After making the Transform adjustments I hit the R key to open the Crop tool, unlock it, and manually adjust. This is especially helpful when applying complex perspective corrections. This allows applying a different crop position, size, aspect ratio, and even PS Content Aware Fill to extend the usable crop area.
Thanks for the extra info Todd. I usually do any Transform work before I do any cropping so this hasn't been familiar to me how the transform tools operate AFTER a crop. I was analyzing a recent forum question and remembered answering a similar one awhile back but I thought the scale operated differently. My mistake. Thanks again.