On certain forms in Altru where a date is asked for you may notice that the date format is showing as yyyy.mm.dd instead of the usual mm/dd/yyyy. You may also encounter an error message that says The section could not be loaded. Year, Month, and Day parameters describe an un-representable DateTime.
If you are entering Seasonal Information on a constituent's address, you will receive the error if you enter one of the dates as 2/29, which would only apply to leap years. Adjusting this to 2/28 should resolve the issue.