BarefootSangerMan wrote:
I used to be able to highlight text in a Word document with my mouse
and then delete it by typing new text or using the backspace or
return keys. One day this stopped working. Any ideas on where the
settings for this would be?

Tools Options Edit "Typinig replaces selection".

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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org