Re:Who's at fault though? (Score 3, Informative)

1) Use white/yellow text on dark background if you can, it is easier to read.

Actually, AT&T discovered back in 1989 that for some users light text on a dark background glows [or "halates"] making the text harder to read. If the goal is to make your presentations "universal" [and to avoid ADA/508 lawsuits for creating inaccessible educational material], the rule is DON'T use white/yellow text on a dark background.

See "Open Look: Graphical user interface style guidelines."