OK. I don't know the root cause, but the resolution points to a bug in the all-classes.js ExtJS file.
Head over to the JSFiddle example referenced above.
Note the all-classes.js file soured in the 'Managed Resources' tab on the left.
If you have this file on your server, comment out the 2 very long lines starting with:
Chances are you don't need them in your webtop/desktop app. If you do, start looking there.
THANK YOU all for helping!
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