Air Masses. An air mass is a large body of air with generally uniform temperature and humidity. The area from which an air mass originates is called a source region. Air mass source regions range from extensive snow covered polar areas to deserts to tropical oceans.
The new Indigo Kodi add-on from TVADDONs replaces some of the other add-ons released from that group including their wizard, maintenance tool, log uploader, notifications tool. However, it appears that the new Indigo add-on goes a step further than just replace those add-ons.
I had the same issue with ElvUI. Do not even bother to use the action bars from ElvUI. Go into the configuration menu from ElvUI and disable the Action Bars. Then get the addon Bartender4. To me it looks like Bartender has been worked into ElvUI, but the feature for dual spec has been forgotten. By using the original Bartender4 you also get the dual spec functionality, and it is working just fine together with ElvUI.