Currently I am using the default settings. I am not allowing useful ads. I had uninstalled and then reinstalled the client. Deleted all cookies and browser history. Let me know if there is a specific setting I should use. As I mentioned before, I did send an environment dump to support for review.
Yes, unfortunately it has returned again for me as well. On my computer and my Android devices too. It is occurring on both Chrome and Firefox on OS X and Windows. Safari on OS X is not affected nor is Explorer on Windows.