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So, there is a change in localstorage for <User>-blacklist (and filters) variables. In 5.0. its a standard jsonobject:

{"domains":[],"groups":[],"endpoints":[],"hideUnmanaged":false}

But in 5.1 this has been changed to a string with all quotes escaped:

"{\"domains\":[],\"groups\":[],\"endpoints\":[],\"hideUnmanaged\":false}"

Im running both 5.0 and 5.1 in my tests so now I need to clear out localstorage when changing