Version 2.70, and most likely previous. I change the order of the modules but they don't stick on a restart.
Ex. Main, Module1, Module2.
Change to:
Main, Module2, Module1.
ON restart:
Main, Module1, Module2.
Ex. Main, Module1, Module2.
Change to:
Main, Module2, Module1.
ON restart:
Main, Module1, Module2.