It was never really tested that much, that's why it's not advertised as a feature.
in your topic.asp file, around line #49 find the following:
Dim ArchiveView, ArchiveLink
change it to this:
Dim ArchiveView, ArchiveLink, CColor
then around line #774 right after the following:
sub GetFirst()
insert the following line:
CColor = strForumFirstCellColor
That should fix it.