Operating system: elementaryOS 0.4.1,
Graphics card: GTX 1080
Broken: 280, ed24315c6309
Short description of error
If you click on a preset menu entry to change e.g. the sampling settings, nothing happens. The values only update when you close the popup. So while you are clicking the different menu entries you think nothing happens and the presets are broken.
Exact steps for others to reproduce the error
Open startup file, change Render Engine to Cycles.
Click on the presets icon and choose one of the menu entries. Nothing seems to happen when you click. Maybe not technically a bug, but still feels super buggy ;)