I have several workbooks, each with a macro (to rearrange data) that runs "on
open". When I open a second workbook (wk2), the macro runs, then encounters
an error when it tries to run (re-run) the macro on the first workbook (wk1).
My goal is have the macro fire only on the workbook that I'm opening, and
then stop.

I'm curious as to why the macro on wk1 tries to run when the open event has
not occurred. Do I need some type of command to stop the macro in wk2?