While trying to catch this error, i found some interesting things.
(blender have 2 identical windows, but one of them, (launching on right screen) have "start-up image")
1) if I launch blender from dash, problem appears only if I press on right window first.
2) if I launch blender from launcher, problem appears, but if I don't touch other windows, I can restore this.
-- so, i minimize and maximize left blender window - and all is ok.
While trying to catch this error, i found some interesting things.
(blender have 2 identical windows, but one of them, (launching on right screen) have "start-up image")
1) if I launch blender from dash, problem appears only if I press on right window first.
2) if I launch blender from launcher, problem appears, but if I don't touch other windows, I can restore this.
-- so, i minimize and maximize left blender window - and all is ok.