The feature you have included so you can unselect all mounts or select all is not working at all in Beta Version 10. I hope that is self explanatory? If you try you will see exactly what I mean.

Also I had to a complete uninstall and reinstall the addon to even get it to work the first time. I received heaps of errors when I logged into the game and I quickly logged out and deleted everything including Saved Variables and then no more errors, except the one I have previously reported and updated for you. I didn't know what to name the ticket for this or where to really put it, so hope you don't mind it being mentioned here and if you do want a separate ticket -- any ideas of the title? It seems there must be redundant files or corruption occurred on install of Beta Version 10? Just food for thought more than anything and it might mean suggesting everyone to delete the old version when you release the release version to make sure no errors etc and have a clean start. I don't mind doing it because it is beta and alpha, as well as expected. Again just my opinion is all. Some addon Authors do that on big changes and usually apologise for the inconvenience and never seen or heard anyone complain when it is mentioned and if not they obviously do very quickly complain lol.