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LiveCode Indy 8.1.2. Mac OS 10.11.6

What would cause a stack to lose the correct card navigation?

From the message box this is returned when the actual card is "Visual_Identification_4"
put the long name of this card
card id 1002 of stack "/Applications/LiveCode Indy 8.1.2.app/Contents/Tools/Toolset/palettes/menubar/revmenubar.livecodescript"

A second time and it's correct
put the long name of this card
card "Visual_Identification_4" of stack ect

I complete a couple of cards and try again when the actual card is "Visual_Identification_3"
put the long name of the recent card
card "Start Visual Identification" of stack ect

There is one main stack and two substacks.

Thanks

You just loose the focus of your app.
Take a look of what appears in message box subtitle (at the right of the button), if your card name isn't shown, message box refers to the IDE, not to the app.
You may click on the subtitle to choose in what stack you are working.