Pure Red Eye, I'm not sure exactly, but it's been a problem for some people for as long as I can remember. Windows, Mac and Linux use different codes for line endings, so that may be the source of it. I recommend pasting your key into a text editor. If it has the blank lines, remove them and save it in a text file. Copy it from there, and if it pastes correctly on the forum, then it should paste correctly wherever else you decide to paste it.