In my specific case, the Persona Bar error and broken display appeared when upgrading from DNN 9.8.1 to 9.10.2 and following the instructions for removing Telerik from the site. In Manage / Site Assets, when I replace the Digital Asset Management module with the Resource Manager module, the page breaks.
If I set the Resource Manager to IsDeleted = 1 int he TabModules table in the database, the page will load again. Also, if I turn off the "combine files" option just for JS files, that allows the page to load.
Is there a specific reason "combine files" should be disabled? I did this for JavaScript and it resolved the problem I was having. I am just curious if the ability to turn this back on will come with a later release of DNN or if there is something I can change in my configuration.