Custom Lists: Cannot store headers to same

I am using ver. 6.5 (3126) on a windows 8.1 pro machine. I am trying to save a list of headers that resulted from a search. The program seems to be processing the request, i.e., a progress bar appears and takes some considerable time to complete. When I go to review the list of headers in the newly created custom list, it appears empty. Any ideas on how to figure out what is going on here would be greatly appreciated.