Hi Rudy, we are experiencing this as well. Our detailed steps are as follows:
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Have one person add the plug-in and make a UserWidget on an actor that uses the web browser widget.
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Check-in that work.
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Possibly relevant: upgrade to the latest hotfix version. In our case 4.12.3 to 4.12.4.
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have another person add the web browser widget to an existing user widget archetype.
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Compile and save.
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Close the project and reopen it.
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Result: The widget that was added by the initial user still works fine, but errors about cannot find file for asset /Script/WebBrowserWidget are thrown for the Web browser UserWidget that was created by the second user.