Path issues are always confusing to me but can eventually get them correct. Having relooked at your settings, if the above does not work try it differently;
For my "Directory" settings I have just simply weather whereas you have /fitzweather.com and for both us our realtime.txt are updating;
In my "Files" tab I have weather/CUtags.php so perhaps yours should be /fitzweather.com/CUtags.php
Paul