My issues started after using two screens, and working with QlikView on both screens. Screen that normally appeared on screen did no longer appear on the screen and I could not continue with what I was doing...
First, the 'Script Execution Progress' pop-up window did not appear on the screen after clicking on the reload button. I knew something did happen after clicking the button, because I could not click anywhere on the main QlikView window. After clicking on the Windows key and the left/right arrow keys, the window appeared back on screen. So, it seemed that the window remembered it's old position on the second screen and thus was not shown when I only used one screen.
The second time, I tried to rename a tab in the Edit Script screen, but couldn't see the window that normally opens. Using the Windows key and the arrows didn't work this time. When I clicked the Escape key, I could again use QlikView. Also, when I entered something randomly after clicking 'rename' (via 'Tab' in the menu bar), I saw that the tab was renamed after clicking enter. So, the rename window again was opened off the screen. I had to find a solution for this annoying behaviour.
The solution is to reset the positions of the windows in the settings file (Settings.ini).
The software I use: