The option "Use local 'man' page" in the Setting menu fails with no feedback. When displaying the knmap nmap man page, clicking it has no effect. The old manpage continues to be displayed.
Now, I know you will find this a bit hard to believe, but code that I write (very) occasionally contains some unwanted "features" (other less polite people would use the term "bugs").
If you believe that you have uncovered one of these features, please do not log it here. To reduce project maintenance, I will only be checking this page "once in a blue moon"...