Joe, check the date in the 'Print/Age as of' field -
Print/Age as of
Select an option and enter a date, if applicable, to use as the cutoff date for the Historical Aged Trial Balance report. Any document that has a date on or before the Print/Age as of date is included on the report. For example, if you select Beginning of Month, the report includes trial balance information aged as of the first day of the current month.
I always make sure this is set to the current date.