Quick Mask mode has suddenly stopped working.

I have Photoshop CS5.  I have successfully created selections hundreds of times using Quick Mask mode, but today it has stopped working.  Here are the steps I am performing:
Activate Quick Mask by clicking the rectangular icon at the bottom of the tool bar.
Using the brush tool with opacity at 100%, I paint a selection. The familiar ruby-red color is there to show what I have painted.
Once I am done painting my selection, I re-click the Quick Mask button, which is supposed to convert whatever has been painted red to a normal selection, outlined with marching ants. I was doing this many times just last week and it worked perfectly.
But now, instead of seeing the marching ants highlighting my selection, I see nothing at all. The red highlighting disappears and nothing is selected. To make matters worse, at this point in the process Photoshop never fully disengages from Quick Mask mode and gets stuck there. If I click the Quick Mask icon again, my original selection reappears painted in red. From this point, I can't seem to get out of Quick mask mode and the other tools no longer function properly.
I tried resetting all preferences. When that didn't work I de-installed and re-installed Photoshop, and that didn't work either.  Has anyone experienced anything like this?

Its possible you accidently hid the selections. Look in the view menu and see if selections is marked to be shown or hidden. I think it is ctrl-h or cmd-h but at the moment I don't recall. Once I boot up photoshop I can verify it.

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