Fill and Font Color Change

I have a pretty basic workbook with 16 worksheets in it.  This morning when I opened it up to enter some data all of my fill colors (gray) had turned to black.  Also my font had turned to Red.  When I try to change it back it will not allow me to.  If I turn the font to black it turns the greyed out color in another cell to black.  It is very odd.  Any help would be appreciated!