Removing the Date Range fixes the issue but it makes load times long becuase you are loading the entire database. It looks like the MaxDate has a bad value. This is what I did that fixes the issue. Just add a line to set the MaxDate. Now it loads quick with just 1 day of data populated.
/Set Date Ranges
dtp_Start.MaxDate = DateTime.Now.Date.AddDays(1).AddSeconds(-1);
dtp_Start.Value = DateTime.Now.AddDays(-1);
dtp_End.Value = DateTime.Now;
/Set Date Ranges
dtp_Start.MaxDate = DateTime.Now.Date.AddDays(1).AddSeconds(-1);
dtp_Start.Value = DateTime.Now.AddDays(-1);
dtp_End.Value = DateTime.Now;