Renaming Master Comp breaks Expressions
Sometimes you want to rename your master comp, and that comp probably has your master controllers for linked expressions from other comps.
Sometimes, After Effects hits you with a bunch of errors when you rename the comp, and then you have to go and repair each expression (you can use the script find and replace in expressions to fix).
The faster solve is just to use AE Global Renamer to rename your master comp - it will work and keep your expressions intact.
I'm posting this as a little tip for posterity.
