I tried the solution in https://answers.splunk.com/answers/791943/tabs-in-dashboard.html and it's working for me. In particular, I changed the line
$('a[class="toggle-tab"]').on('click shown', selectTab);
I'm not using a submit button or token so I deleted all the lines related to tokens. But if you do, there is another line with "data-toggle" that you have to change.
Also make sure you clear your browser cache as it may be caching the old file.