I have a Lenovo Thinkpad E550 with Windows 8.1 here that shows the following weird behaviour since today:
There is a square/rectangle of about 8-10 cm in the center of the screen that doesn't react to mouse events.
This is independent of:
the pointer device I use:
- 2x USB mouse
the program I'm in. It happens in:
- Firefox: I can't select text fields or buttons that are located in the center of the screen.
- Control Panel: The background color doesn't change on hovering over items in the center of the screen. I can't select these items with a pointer device either. The items react to pointer events if I drag the whole window to some other place on the screen. Selecting with the keyboard works always.
- Desktop: I can't drag shortcuts into the mentioned area. ( symbol appears at pointer)
It seems as if there is a completely transparent and hence invisible window sitting on a top z-position in the center of the screen that prevents mouse events reaching the windows behind it.
I tried the following so far:
- I rebooted a few times.
- I ran Windows Update including the latest optional updates which included hardware updates.
- I checked the Event Logs but couldn't detect anything suspicious.
- I performed a virus check that didn't find anything including:
- boot sectors
- root kits
- entire drive
This is not my computer but the user told me that she didn't do anything remarkable since yesterday.