if u use 427 for too long it turns u into the blob monster, and it makes u look like your always crouching since u dont have legs anymore. that is most likely what happened.
I believe Teslas can have their event turned off by default in some maps as part of the random generation. saw it happen in one of the first maps i ever played.
You need to find this room in Light http://i68.tinypic.com/2h57fbc.jpg needs Level 1 keycard then go inside the second door to the left and watch for 173 behind or infront of the glass, move to your right quickly and grab the keycard without turning away from him and leave the room again before you ...