curtain call glitch, so i get strength to follow me down and rex like half way down and suddenly rex is gone. i have cleared the tower of enemies and can't find rex, i want to complete this mission but rex is no where to be found. any tips on what i can do?

Wrong forum. You need to ask such questions in hints, cheats and spoiler forum. You need to wait until your post have been moved to proper forum.

Cheers,

-Klevs

Rex acts like a Companion and will automagicaly move to the next lift in a few parts of this Quest.

he hasnt i have gone up and down the tower about 3 times and cant find him. i think i lost him around one of the lifts,

http://fallout.wikia.com/wiki/Curtain_Call

Look at the Bugs section!