I'd been following the thread, but until you whittled it down to using that Wacro, it could have been (almost) anything.

"setLightStyle.py" has the same problem.

The simplest way of curing it would be to move the lines that do the actual work into a subroutine and call that like most of the other Wacros do.

One thought, getting people to edit their copy of the Wacro might cause problems when CL release an updater if it checks file timestamps or sizes.