If my doc contains an upper case "T" then every thing after it disappears. It looks as though it's still there because the cursor continues to move and it will even flag grammar and spelling, but you can't see it. I'm sure I've hit some button or selected something I shouldn't have, but I can't figure it out for the life of me. Help. Please!

Your description suggests you've hidden the text. Does it re-appear if you click on the ¶ symbol on the Ribbon's Home tab? If so, it's hidden. To unhide all content, use Ctrl-A, then Alt-H, F, N to open the font dialogue and make sure the 'Hidden' option is neither checked nor shaded.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]