Where Used customization - More than one 'Script' record exists for

Wondering if anyone has seen behavior described below with form customizations?
Or any ideas what is going on with the "Where Used"?

This is in V8.03.410 when I try to customize the "Where Used"
from either the Part Tracker or Part Maintenance.

My Script Editor changes disappear after saving and reloading the form.
i.e. looks like starting a fresh customization again.
(but... when I toggle the Hidden property for columns in the gWhereUsed... those are sticking)?

As a test I then tried exporting after making changes.
After exiting, deleting and trying to re-importing the customization (a few times)
I get this error re-importĀ  which I've never seen before:
"More than one 'Script' record exists for this import. Would you like the import utility to automatically delete all but one of the script records?"

Note I'm aware that I need the same name for the parent (PartTracker) and child (WhereUsed) forms,
i.e. customization name for both is "PartTracker01".

Customizing other forms is working as expected.

Thanks for any ideas, I'm baffled right now.

P.S.
Looks like a bug in V8.03.410.
Just got a hold of an E9 test system & everything works OK there.