Hello, Gerry.

Synkmark can only keep track of the Last Visited Date if the web browser keeps track of it in their bookmark records, and unfortunately, the only web browsers which do that are OmniWeb, Camino and Opera prior to version 15, web browsers which you probably never heard of if you are under the age of 40

The feature was actually inherited from BookMacster which still supports these browsers.  Unfortunately, none of Safari, Chrome or Firefox support this.  They do keep track of Last Visited date in their History, and theoretically we could get it out of there, but it would be unsupported, complicated and maybe too fragile.

To verify the issue, click on one of the column headings in the Content of Synkmark and change it to show "Last Visited".  The columns will probably be empty.  You will get a Last Visited date on a bookmark if you visit from within Synkmark, but that is not the way Synkmark is designed to be used.

I've entered this as a bug in our Bug Tracker that we should consider.