I just installed CC2017. When I use the quick selection tool, the marching ants disappear when I un-click my mouse. It seems like it stays with the item I select for a portion of the time and then, for no reason at all, it expands to the perimeter of the visible screen. I heard that there was a similar issue back in 2015, but scrolling through the forums, I didn't find an answer to it. I've unchecked the the performance boxes under preferences but no change. Can someone please help? Thanks.