It's a bug in the snippet code, not the cms itself...
Instead of flaming around just report this bug at
http://bugs.modx.com/ and/or modify include.getpage.php as already pointed out and there you go.
discuss.answer
F*ck you guys, I solved it myself. Modx is a great piece of software, but the community f*cking sucks. So long *ssholes!
btw. Chris, thanks for your answers and patience. I truly appreciate your help, and my annoyance is not at all with you, but with the rest of this f*cking community. Have a good one!