I can't for the life of me figure this one out. On a few slides roughly half of the notes on those slides were shown in dark red. When i highlighted the entire note and chose black, the entire note was then turned red. On another slide that was doing this i just highlighted the portion that was red in the Preview and chose the text to be black. When i went back into Preview--no change.
This shows up in the Preview, not in the PPT.