If you have added a new account, it will need to be allocated in the Account Tree to show in the reports:
Navigate to: Reports > Report Tools > Account Trees
Choose the Account Tree used in your report
At the top there is a section SHOW NEW click to reveal all the new accounts
If required, expand all the drop down arrows until the individual accounts show with a check box
For each account Tick the box, and then select Move to Tree, and choose the header you wish to place it to from the drop down list
SAVE CHANGES at the top right
Re-run your report to check all is well