https://bugs.winehq.org/show_bug.cgi?id=51924
--- Comment #12 from Josesk Volpe joseskvolpe@gmail.com --- This bug occurs when KEmulator tries to start while it's windows touches out of bounds. I've found an workaround when this happens:
1 - Open winecfg > Graphics and turn virtual desktop on 2 - Set resolution higher as possible, greater than 800x600 3 - Apply and close winecfg and open KEmulator.exe 4 - Move KEmulator to the top-left screen corner 5 - Close it, and now you can turn off virtual desktop and re-run KEmulator :3