Try using "Format Painter" to make the cells that have the exact cell format to reduce the # of font/colour scheme used. ie. if cell a1 and a2 are bold & green and you apply the format separately, Excel will count them as 2 formatting. If you format a1 then paintbrush it to a2, Excel counts it as 1 formatting. I think there is a 3K+ limit for the font/colout per worksheet.