Currently Being ModeratedApr 15, 2013 8:23 PM (in response to SLP1407)
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Doesn't actually sound like a PowerPoint problem.
To me, it sounds like you've somehow activated the Character Viewer in , System Preferences, Personal, Language and Text.
The checkbox near the bottom of the screen to 'Show input menu in the menu bar'
Then, clicking on the flag opens a dialog window, including Show Keyboard Viewer and Show Character Viewer
and that reveals the Characters window.
These screenshots are OS X 10.6.8 on a 2007 MacBook.