[Lynne]

What is your userid? Go to your database and look at the usertextfield table for the row with your userid. Then change the field usertextfield.searchprefs to:

a:1:{s:20:"cmsadmin_showperpage";i:20;}

Then Maintenance > Clear System Cache. You should then be able to edit the section. You set the number of articles (at the bottom of the section page) to a number your server cannot handle. You may be able to increase it from 20 to 50.