Hi,
That checkbox is only available in Debug versions of MM in About dialog. Same thing goes for Debug context menu.

I've never used it, but here it's a check box in lower left corner of Help>About.

I'm using the Portable Debug version 3209, also Gold. Not sure if it has to be the Debug version?

If not there, hopefully the MM staff will be along shortly.

I have looked under Help->About but there appears to be no way to turn on Developer Mode. I have MM5 Gold.