After espionage orientation, when doing the extra objective, after I climb up the stairs where the first camera is I walk into a room, where there is a door I need to walk through, behind that door is the endless abyss and I fall out of the level. Any ideas how to fix this?

Issue resolved. It seems that a skilled agent, when posed with an obstacle, must look into the dark abyss of secrets and lies that is his soul, so that the path may materialise and the way be shown to him.

It sounds like you got into the level before it finished loading. If you changed something that involved streaming in the .ini files that might have something to do with it.

 

Specifically onlystreamintextures=(default is false) and/or bUseBackgroundLevelStreaming=(default is True).