Just to give my feedback as well.
I have a couple of days that updated to build 3143 on my Linux box.
I have the same problems with the colors of the new GUI and I don’t think its my eyes.
I had created my custom color theme and used it happily for last 2 years I think.
After the upgrade the background color of my theme seems more light (maybe due to contrast to the tabs and the rest of the system).
The filenames in tabs seem less clear than before, don’t know if it’s their color or the font. I experimented with various themes but I can’t get the previous visual situation with which I was totally satisfied.
One of the reasons I use sublime text is also its GUI and visual style.
With build 3143, in my opinion, there is a regression on that front.
I should have a very easy way to be able to restore the previous state and change log should state it.
Thanks for listening.
BTW, I did see the other comments and links on how to resolve it and will try as soon as I find some time…but it’s the first time in years I felt I had a serious regression in sublime text usage.