[TimeZone]

I just got the new update and I'm not feeling it. Maybe the neutral gray color will grow on me but the volume bar disappears!

First, let’s try to get to the bottom of the problem quickly and see if we can fix it.

The new version of Aeon Tajo requires you to select colours (colors) used in various parts of the skin if you use Kodi 20-Nexus, which you said you do. It could be that you have not chosen a colour yet (makes it difficult to see highlighted items) or that you chose grey (gray). See my screenshot below, I have no grey. It is an improvement, you can now choose any colour you like, don't wait for the grey to grow on you if you don't like it.
 

How was that not tested?

Second, how do you know it was not tested? It could be your set up.
How about a little decorum for free stuff? One person designs Aeon Tajo, one person builds it, one person tests it and releases it to the public. One person can miss a lot of bugs. It would be better if the rest of us users reported a bug if we find it rather than using a tone that sounds more like a complaint to the only one developer. Did you even remember to say thank you first before reporting your problem with the new update? 

I am telling you because I know for sure the dev does not like this. Call it positive criticism or whaterver you like but this attitude has almost killed Aeon Tajo. I wish he doesn't see your post but he will. There are a lot of people like you who only complain and do not appreciate his hardwork even by saying thank you. If you don't like Aeon Tajo, kindly move to another, don't kill it for all of us. He is only one person and if he gives up, thats the end of the skin. Same thing with Kodi and all open source work, appreciate them or find alternative. It breaks the developers hearts. Bug reports, feature requests and finding faults are of course welcome but try to be friendly because people do hobbies to be happy and to devs, this is all a hobby. It it causes more grief than happiness then they will just drop it.