Wrong button detection at low resolition

Hi there, I start to convert my old NGUI project to new Unity 5 ui. But I have a problem with mouse detection at 1024x768.
Is I start the game from the build in Fullscreen mode the mouse detection collider of a simple button isn’t aligned with the button texture.
there are no problem in editor mode.

Does this happen on Standalone build? Which version of Unity are you using? (if this is the latest available, please report a bug and attach your simple project to the report).

This is a known bug:

For a temporary fix, run the app in the same aspect ratio as the monitor.

Disable “Use Dx11” in the player settings, that fixed it for me on all resolutions it works now.