After upgraded to Yosemite, I've found that the mouse selection is basically broken, e.g. when I select, I follow the steps
- mouse down, start select
- end select, mouse up
The problem is, when I mouse up in step2, basically what I selected, has 50% of chance is being unselected.
I can't reproduce the issue every time, but given that 50% of chance, it is very annoying..