Cannot add header using '#'

I can’t seem to add headers using ‘#’. nothing happens when I click on the ‘#’ to add headers. I am using version 0.13.24.

Thanks in advance.

Please resubmit this bug report and make sure that: 1) you follow the bug report template, 2) you use the default theme (no css) and 3) there are no third-party plugins enabled (You can use the help vault for 2 and 3).