Hi Jean,
Go in Section Expert and see you have applied a conditional suppress for any of report sections.
Also go in Report Menu--Selection Formula--Saved Data check you have any conditon.
Also go in Record Selection Formula and on top there is drop down with two options 'Exceptions for nulls' and 'Default Values for nulls'. Select 'Default values for Nulls' option and check.
Also go in File --Report Options and check first two options 'Database nulls & Other nulls to default values'
-Sastry