Expand square selection clips corners - help please

I have Photoshop CS. I made a rectangular selection and expanded it by 100. I expected to get an identically-shaped rectangular selection that was 100 pixels larger, but the corners were clipped. I tried other values, such as 75 and 25, with the same results. What's up with that? There's no feathering selected; I also deleted my prefs in order to start from scratch.

Thanks.

I cant offer you any help on it, but it does act the same on my machine. maybe you could use the polygon lasso to add to the selection on the corners, but there must be a better answer why it acts that way.

I don't know, too. But I found a workaround. After dragging the selection, right-click inside it and click Transform Selection. Shift-drag a corner handle or enter the desired numbers in the Options Bar.

Thanks to you both. I guess all I can do is try the workaround, but obviously, I'm sure we would all like the feature to work as it's supposed to. It never used to behave this way - very strange.

Thanks again.

Not only that, when trying to expand a rounded selection, it doesn't expand perfectly round - it shows a shape distortion similar to an octagon.

Maybe I'm confused and expand never gave square corners. Are diagonal corners the norm when expanding a square or rectangular selection?

Thanks -

These distortions have been a part of the way Photoshop has dealt with expanding selections for as long as anyone can remember.

If this behaviour bothers you and you need precision, make a path and, when you have what you need, convert it to a selection.