Also occurs on 3.0.16. How would I reset the configuration?

The dialog triggers it, not the OK button. You had that right. The trouble is that I cannot click the OK button, the 'Do not show again' checkbox, or anything else in the pop up (or main window). Or...

Clicking on OK produces no more response than clicking anywhere else. Will try a full reinstall this evening. Should that fail, is there a way for me to generate a log file for you?

On OSX10.10.4, TS 3.0.17, Qt Version: 5.4.1

When I am moved to a moderated channel and I get the popup 'You can only speak if Talk power has been granted to you' etc., clicking on the popup or...