I installed some fonts from the Internet. Somehow my Times New Roman font was corrupted. I still have bold and italic, but the regular Times New Roman font is now a different font. Is there some way to correct this problem? Thank you.
Download MainMenu and clean out the font caches.
And download Linotype's FontExplorer X (latest version) and use that to manage your fonts instead of OS X's Font Book which isn't very sturdy especially with fonts downloaded from the net which could be a bit wobbly.