do you have more than 100 rows of data?
if so you may be running into a variant of "Multi-level Category Axis Fails
with 100 rows of data"


"maryrose" wrote:

I have an excel chart. The horizontal minor gridlines (y-axis) show
correctly. Some of the vertical minor gridlines (x-axis) are missing. Any
ideas on how to correct this. I can turn the minor gridlines off, but I
would like to have them for my content.