So I installed dev build 1.5.0.13.
Personally I still miss the bright green selection marks that really stand out.
I do a lot of mass deletes from my inbox and need the best view of what I have selected for the delete.
Between you and me, your app was the only one that did this excellent, and this was a big plus for your app and made me buy pro eventually.
I will continue to use your app, because it is one of the best apps. Just hoping you revert to something with better contrast.
EDIT: if it is not going back to bright green, then why not make it white? This is in line with the mark color of your animated image, and has much better contrast then the blue.