When I start up SU2015, No Welcome Screen shows up and only minimized windows on the task-bar (pinned), but I cannot maximize the window. SU2015 starts only when I close(kill) the minimized Welcome Screen.
Have you recently change the number of screens you are using or their layout?
The dialog is opening where it thinks the screen is. You can look for it by going to the screen resolution settings and moving the monitors around until you find it.
Sometimes just removing a screen or adding one is enough to get it to work.
Thank you !
You are right. I have added a new extended display.
I have solved the problem by resetting the screen to single display, then
invoke the SU.
While SU is running, I have add extended display.
Then it seems working fine.