Choose a matching .cnc file ...
You might find you are not getting successful connections to the source text file after a lot of editing if the file-names have got misaligned.
If Concord detects a mismatch in the file data, you may get a warning reporting a file mismatch, and an automatic request to supply a .cnc file with trustworthy data. Simply compute another .cnc on the same text files using the same search-term(s). Do not trouble to edit this but save it. The saved .cnc file will now serve as a trustworthy source to fix links in the previous edited .cnc file and the connections to the source texts should be restored.
How to do it manually
The menu option to make this happen manually is Compute | List of file-names.