Version 1.6.25 close icons are not hot centered

In this new build, when I click on the close icon – the x in a circle – on the tab, when i point to the x nothing happens. I have to aim at the top of the circle around the x for the close in order to close a tab.

Running Yosemite 10.10.4 beta.

I moved a post to an existing topic: Mouse actions in tabs work only on very top pixels and not the full button