Hello -
I have several dashboards that are presenting the user with a pop up box 
Reviewing the Browser Console, I see the following:
The culprit seems to be common.js
The dashboard is already using the version=1.1, that I have seen in other posts.  The dashboard doesn't reference any .js scripts nor does it use any lookups to generate results.
<form version="1.1" hideEdit="false">
Any suggestions are appreciated.  Thank you.
However, this issue persists.  
QQ:  Any custom JS you are using across dashboards?  
KV
I know of one file we have (multifix.js)
We use it to modify the behavior of multi-select filters.
/*************************************************************************************
Multiselect Behavior Modification
multifix.js v0.2
Automatically removes 'All' option in multiselect fields when a value is selected and
remove individual values when 'All' is re-selected. 
Any multiselect with an CSS id of multi_1 - multi_15 will function in this way if 
the script is included or the app's dashboard.js or directly.
*************************************************************************************/
require(['splunkjs/mvc', 'splunkjs/mvc/simplexml/ready!'], function (mvc) {
    $(document).ready(function () {
        var selection = [];
        for (var i = 1; i < 16; i++) {
            multiFixer('multi_' + i);
        }
        function multiFixer(fieldId) {
            var multi = splunkjs.mvc.Components.getInstance(fieldId);
            if (typeof multi !== 'undefined' && multi !== 'undefined') {
                multi.on('change', function () {
                    selection = multi.val();
                    if (selection.length > 1 && ~selection.indexOf('*')) {
                        if (selection.indexOf('*') == 0) {
                            selection.splice(selection.indexOf('*'), 1);
                            multi.val(selection);
                            multi.render();
                        } else {
                            multi.val('*');
                            multi.render();
                        }
                    }
                });
            }
        }
    });
});
Does it happen for all users or just some?
If so, it could be cached JS