Yes, it's immediately after logging in. One user reported it only with Safari, others have reported it with the latest version of IE running on windows, and still other users have not reported it at all.
Better post a link to a text version of your config.asp. I'm moving this to the Help:Mod Implementation forum, since this is a modded Snitz forum issue.
You should check the timezone mod's default values for each user. I am guessing user's don't have default time zone values, so an empty recordset is being returned when they login.