Using latest version on XP. I have a 237 KB text file that is one line. It is a very big messy page of web page source. If I wrap it to the window with TextPad and do select all only about 1/5 of the file content is selected/highlighted by the selection. If I hit the unwrap button and the file is portrayed as one very long line in TextPad, and then do select all I see all the content is properly selected - the whole line is selected.
Next time you scrape a big site, usually it all goes into one long string with one eoln at the end. Try what I'm doing. If no one can reproduce it then it will probably never get noticed. The string or line has to be a few hundred k.
Lee, have you examined your file using a hex editor such as XVI32?
I suspect that you have some non-text debris in your scraped file.
Which is probably why we can't reproduce your issue with our clean files.