I used to have tabs for PowerPivot and Power Query on the ribbon but after an excel crash whenever I open Excel they no longer appear. I have to go in and uncheck them under COM Add-Ins click OK, then go back and check them again which will then put them on the ribbon. Why would they not stay on the ribbon (there is nothing in the disabled add-ins) when I close Excel and open it again. Very frustrating to have to re-enable them every time I need to open Excel. Has anyone seen this behavior before or any ideas how to fix this? Thanks for any help.