On the launcher, there’s a blue box that appears when I select anything, and it is constantly moving when there’s more options for it to go to, as if someone was holding down the tab button. It stops me from being able to scroll and see updates and news in the app, and is quite annoying. I have a video showing the problem as well if that could help
yea it seems to be an ongoing bug as of recent. theres another post of the same complaint from the beginning of the week. i have it myself.
SAME! This is driving me crazy. I can’t type in boxes or search for games because these blue boxes are constantly moving. I actually thought I had gotten some sort of malicious virus and reinstalled windows… twice 
And no reaction from Blizzard !!!
I picked up this issue starting today.
If you have a joystick or steering wheel plugged into your computer, unplug it, then close and reopen the application. This causes an issue, even with virtual joystick drivers (even if they are not connected). I think Blizzard is working on an update to control the application with a console, and things didn’t go very well.
Was planning on buying D4 since it’s on sale but im not going to disassemble my driving rig just for this stupid app to work properly 
Disassemble?
Maybe try disconnecting. Much simpler. Less drama.