I have a string that has been giving some of my code fits of rage and its got "extra" characters in it that I only stumbled upon by using the arrow keys to go through it. I noticed that the cursor stayed in place in certain areas for an extra keystroke of the arrow key. Using View >Show Symbols > Show All Characters still didnt seem to indicate anything there. What kind of character could be there and is there a plugin for it?
If you really want to get a raw look, check out the HEX-Editor Plugin (Check the Plugin Manager for it). You'll see the character codes for everything; even non-printable characters.
I use it, and have no issues on the newer versions of Notepad++.