logarithmic trendline not displaying on chart

I have been trying to add a trendline to my chart, the equation and R-squared values display, but the line is nowhere to be seen. I have adjusted the line options to ensure that there is a thickness, transparency is set to 0%, and that the line option is a value other than “none”. I want a logarithmic trendline, but tried a linear trendline as well and it also only displayed the equation and not the line itself. I had previously worked on the spreadsheet, created the chart, saved the file and closed the program. Upon reopening the file I’m having this issue.

Using version on Windows 8.1

Can you open a bug report with a test document?