Thanks for helping ant, I honestly just don't remember this mission.
Thing is it sounds like the OP simply can't find Larry and that it's not a "glitch", is that right? Because if it's not a glitch then the thread title is completely misleading...First he said the characters disappeared and then he said he just didn't know where Larry is. So I don't know which problem he's actually having anymore.
Maybe tomorrow when the beta re-opens he'll sort this out!