Lists

I recently created a list of all patrons who purchased tickets with us this season.  Report is 117 pages long.  Ran the list from Reports & Utlilities - Lables and Letters - User Defind Format..."  Looks great on screen.  We are then able to double click the patron that needs a correction and save (cleaning up address format).    Worked great until page 36...at this point we lose the ability to drill into customer record from screen.  Has anyone encountered this problem?