Just had an issue in glabels when I pointed it at a CSV file one of the fields was missing.

The cause was glabels intelligently determining the CSV encoding to be non-unicode (ISO-8859) and then dutifully skipping the  display of a field with the ? beta  character in it.

Here you can see the file before and after I opened it in TextWrangler and then saved it as UTF-8.

mypc:custom_labels myuser$ file 50025
50025: ISO-8859 text, with very long lines, with no line terminators
mypc:custom_labels myuser$ file 50025.utf8.txt 
50025.utf8.txt: UTF-8 Unicode text, with very long lines, with no line terminators

I also had to re-insert the ? beta character using the mac character map...

Once the file is in UTF-8 format glabels correctly parses and displays the CSV file

So the fix in this case was to check the encoding and convert it to UTF-8