Just want to tell you that latest Cumulusutils v4.5.5 does work fine with latest CumulusMX v3.9.1 which still has the Newtonsoft.Json.dll file in CumulusMX folder.Deleting the Newtonsoft.Json.dll was advised but I sincerely hope it is not a requirement because CumulusUtils still depends on it.
I usually do a full new version copy-in overtop of existing, except \Reports and \web folders, and then check file dates to see which are updated, or not updated, so in the latest v3.9.1 update the old Newtonsoft.Json.dll was left intact. I presume for new installation not including the Newtonsoft.Json.dll may then cause an issue for Cumulusutils.
As an additional comment I see that now after our change from daylight savings to standard time my Cumulusutils page Station time as an hour ahead and Browser time correct. Have I forgotten a setting somewhere in Cumulusutils?