The time setting for Active Topics Since does not seem to be saving in the cookie. I originally saw this on my forum, and thought it was due to a mod I made to active topics to add a time increment. However I see the issue here as well. I set a time, such as last 2 days, and a refresh rate, such as every 5 minutes then close the browser. The refresh rate is there when I load active topics again, but the Active Since is set at the default of Last Visit.
The refresh time setting saves in the cookie, but not the "Active Topics Since" setting. I've tried IE and Firefox with same result.
The time for active topics since is set to the date of your last visit, not your last setting for the dropdown. That's the concept for active topics - topics that have had posts since you last visited.