Thanks for your response. Below are my comments on the suggested solutions:
Upgrade to SketchUp 7.1. A new feature to reset the workspace dialog boxes was added. Go to Window > Preferences > Workspace and click on Reset Workspace.
I have the latest iteration of version 8. Tried Reset. Didn't help.
Click Window > Hide Dialogs.
"Hide Dialogs" is grayed out on my computer. Cannot access that option.
First, you want to give the browser focus, so you should select that browser from the Window menu, even if it already has a plus next to it (if it does, click it twice so it ends up with a plus and is the last thing selected. It should then have focus, even though you can't see it.
Then, you want to open its system menu using the keystroke Alt-Spacebar, then put it in Move mode by hitting M. At that point you should be able to scoot it around with the arrow keys. What you can do is to hit any arrow key once and then move your mouse back and forth, up and down, without pressing any mouse buttons. If all goes well, you should see the missing browser moving around with the mouse. Once the thing is back on-screen, click the left mouse button or hit Enter, and you should have it back.
The instructions above are unclear to me. What "Window" menu? What "plus"?
The problems I'm having are on my desktop. I completely uninstalled and reinstalled SketchUp. That didn't help. I then installed SketchUp on my laptop, and the shadow dialog box DOES work there, so at least I know it isn't something I'm doing wrong.
My final question: How important is being able to move the shadow around. If I don't have that feature, will I ever care?
If anyone has any other suggestions, please chime in.
Bill