Originally Posted by Cosmo

Thanks again. It does appear to be a document level setting, creating a new document retains the currently set value.

I believe I should be able to get away with using the 'WindowActivate' and 'WindowDeactivate' events to change and reset this value so that it won't affect any other documents the user has open at the time (just in case). I did a quick test, and that seems to be working.