Screen saver unlocking is completely unintuitive (usability bug)
Trying the latest 4.28 from a week ago, I left it alone for a bit. When I came back, the screen was filled with a plain color and a clock - seemingly a screensaver.
It took me several minutes of clicking around and trying various buttons before I discovered you need to drag it up to unlock it. WTF! That's completely unintuitive.
If you insist on using such an unintuitive unlock method, please include instructions on the screen saver screen. "Drag up to unlock" or similar.