(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Short description of error
Not opening on Screen1 like it used to?
Exact steps for others to reproduce the error
Er.. Uhm.. Just opening it.. :)
Based on the default startup or an attached .blend file (as simple as possible).