Operating system: Windows 10
Graphics card: GTX 660 Ti
2.80 Beta, 779860d34e26, 2019-02-22, as found on the splash screen
Short description of error
In the render window the UI is positioned incorrectly sometimes which leads to the mouse interaction being offset to the UI.
Exact steps for others to reproduce the error
Open the default project and press F12 a few times. This should render in a new window (maybe the behavior is different on single screen systems, could not try at the moment), where sometimes the UI is moved upwards.