Operating system: macOS 10.14.2
Graphics card: NVIDIA GeForce GT 650M 1024 MB
Broken: 2.80 beta, a77b63c56943 1-7-2019
My MacBookPro went to sleep and was plugged into another Samsung monitor via hdmi while the MBP's display was closed. When I woke up the system later, after lunch, the blender 2.8 beta UI was resized incorrectly. The area where blender renders its UI did not match the window size blender 2.8 beta is running in. See attached image.
Exact steps for others to reproduce the error
Leave blender running with a file being edited. Change the window size. Let the computer goto sleep. Login and the UI was rendered to a smaller rectangle than the windows rectangle. ( resulting in some black background ) See attached image for comparison.
Hope the feedback helps.