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Well if it works on incognito browser windows, then you probably have some helpful extension installed that's breaking it on non-incognito ones.

You are right! It was an old and unused plugin - uninstalled and now works.
(After a couple of try I figured out that there can be problem with the adblock origin too. After disabling and saving the dashboard the save work after reenabling the adblock.)
Thanks

24.7.1 but the 24.7.2 is the same

If I use Chrome the network traffic widget is empty (you can see and move the empty rectangle bit no graph) and clicking the save button it circles forever and gives an unhandled exception error on the console:

Code Select Expand

opnsense_widget_manager.js?v=05956ed8e4fd9d55:573 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'getWidgetConfig')
    at opnsense_widget_manager.js?v=05956ed8e4fd9d55:573:66
    at Array.map (<anonymous>)
    at WidgetManager._saveDashboard (opnsense_widget_manager.js?v=05956ed8e4fd9d55:572:41)
    at HTMLButtonElement.<anonymous> (opnsense_widget_manager.js?v=05956ed8e4fd9d55:290:24)
    at HTMLButtonElement.dispatch (jquery-3.5.1.min.js?v=05956ed8e4fd9d55:2:43090)
    at HTMLButtonElement.<anonymous> (jquery-3.5.1.min.js?v=05956ed8e4fd9d55:2:41074)


Clearing all the cache and cookies do not help.
It is strange that if I try it on an incognito page it works and the saved dashboard good on an ordinary page except the network widget.
Firefox also works.