When saving a file using 'Save As' I can no longer "window" the screen image, it always opens "full-screen" and can't be resized.
Does that mean that it did work, but now does not?
If it used to work, then something has changed. The trick is to find out what it was.
First thing that I check, whenever I have a GUI display issue, is whether there is an update for my video adapter's driver. PS interfaces more closely with the video driver, than some other programs. Simple things, such as OS updates, can render a video driver obsolete, and can cause all sorts of issues. What make/model card do you have? What is the number/date of your installed video driver?
Hope that it is as simple as going to the ATI/AMD, or nVidia Web site, and downloading, then installing a new driver.
Thanks guys I thought it might be a graphics driver issue, but both Illustrator and InDesign work fine and use the same GUI for 'Save As.'
After some more probing I discovered that clicking anywhere on the 'Save As' window top header-bar switches between "full screen mode" and "window mode." The interesting thing is that I couldn't find anything describing this behavior in Adobe's documentation, or using a Google search!