>>>>Anyway, did you resolve the problem or it remains a mystery?
>>>
>>>Most likely, it was a grid with focus beneath the preview.
>>
>>You tell me! <g> Forms with Grids and printing reports FAQ #15515
>
>I know for a fact that the report my customer was previewing was not initiated by a form with a grid. But maybe there is another screwy thing there that would cause the same symptom.
>
>Thank you.

Another reason could be if current data area is changed within the report (including any function calls).