perhaps someone remembers of any trap door closing on behind the player that is in ck so I can take a look?
There's a trigger setup tutorial over at the CK. How about doing it recurrently until it works? Or use this...
http://www.youtube.com/watch?v=4EtFXkvcgIA
...or this...
http://www.creationkit.com/Creating_a_Mannequin
...or this...
http://www.creationkit.com/Complete_Example_Scripts
...or why not this?
http://www.google.de/#hl=de&tbo=d&sclient=psy-ab&q=creation+kit+setting+up+trigger&oq=creation+kit+setting+up+trigger&gs_l=hp.3..33i21l2.1312.6538.0.6689.31.30.0.1.1.4.789.5726.14j4j7j5-3j1.29.0...0.0...1c.1.6lbmnp4wMuk&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.1357316858,d.Yms&fp=8751db711a4e2a25&biw=1600&bih=1037
I mean, it's not like Google wouldn't spit out anything about correctly setting up triggers in the CK.***
*** To create all thoose links and search for YOU, took me 1 minute. I'm 100% certain when following one of this links and attentively read the content, you understand how to correct set up triggers.