All blank lines and tabs are deleted from the .txt file?
(here's directions for notepad, they should be similar to other programs like it though)
to remove tabs: Press Ctrl+H again to open the Find/Replace window (or just don't close the Find/Replace window).
Type \t in the find box and nothing in the replace box. Just hit replace.
Blank lines: Finally, press Ctrl+A to select everything, go into TextFX, and delete all the blank lines.
Yes. I have not altered the .txt file and it was working for a solid week prior to this error. Just double checked to make sure and there are no blank lines or tabs in the existing files.