Thanks Texasjoe. This feature isn't working. I can't fill the boxes with color, grey, or opaque white. I have to switch from three to four colors and back a couple of times before the box will fill with opaque white.
The strange thing is I can see all the fill changes in the color module, but they don't register in the Toolbox. I'll probably have to reinstall InDesign.
Someone suggested I might be having problems as a result of running Acrobat Reader 6. I've removed the program today, because it apparently did interfere with other programs. If you have any further tips, I'd be grateful to have them.
Maychild