Close Rainmeter. Open Internet Explorer. Click 'Properties', 'General' tab, 'View Files', select all and delete; this deletes all temp files and cookies in IE.
Wait a few minutes then start Rainmeter. Weather skins should start working again.
My Night Low Fix:
To change MeasureName=mTemperatureMaximum (by replacing mForecastTemperatureMinimum1). May not make much sense but seems to work.
I discerned this by looking at the Log file Skins tab In the about Rainmeter Dialog. This is the variable that holds the Low temperature, which I guess you could say is the 'maximum' low for the night?
Hope someone benefits..
Thanks to Eclectic-Tech for the Mod! Was sad to have my previous weather skin break last month but this is far nicer!