I made template with a chart.

I opened this template by XLSRW 6.036 and wrote null to the cell A1.
The axis title in a chart lost the "bold" format.

The template and result are at http://www.genet.cz/kohout/xlsrw/201805 ... xample.zip to download.
Josef Kohout
(I noticed similar problem with format at gridlines in a chart.)