Hi friends, I have a problem witn new(4.17) version in UMG tool.
1)Well, when I press button, after t nearly equal 0.8(I tested it with FPS == 1, 0.8 too) button release if I don’t move it.
Video for clarity: UE Button Bug 4.17 - YouTube
PC and mobile have this problem.
I fix it(I think broke it more) when I change OnFocusLost() method in SButton class,
video for clarity: Button Try Fix 4.17 - YouTube
Best regards, your friend, Alex.
Not one answer, not one thought, you know this is a pretty nasty bug. When you do not respond, in the world at least one cat is very sad.
You got me there at the cat. 
What are you trying to achieve? You want the button to automatically release when you move the cursor off the button?
No, I want the button don’t release automatically when I click it. I click on it and after that button released(t = 0.8s ) if I don’t move mouse.
Does not matter, vote please: Unreal Engine Issues and Bug Tracker (UE-50329)
I also ran into this bug and I noticed it disappears if IsFocusable set to false
Thank you sir you solve it.