This is a weird one (at least I think so). Why would the
appearance of a hyperlink change from one system to the next?
I've set the "visited hyperlink" font style to "Automatic."
However, when I return to the style sheet and look at the style
definition, the font is defined as "red." When I compile the help,
the visited color is actually dark green. When my collegue compiles
the same help system on her PC, the visited color is purple (which
is what we want).
(Also, if we change the "visited hyperlink" font to be
anything other than "automatic," it affects the pop-up glossary
link style, which we want to look the same regardless of whether
it's been clicked or not.)
This isn't too weird. It is by design. The help viewer uses
Internet Explorer's settings, which the user can set to display any
color scheme desired. I suspect that maybe your IE settings got
changed somehow. Go to IE/Tools/Internet Options/Colors and see
what you have there. You can override these settings but using
"automatic" will use the user's settings.