Forum Discussion
The Windows 10 Task Manager only displays thumbnails and cannot be opened.
The Task Manager displays normally as a thumbnail (preview window) on the taskbar, but clicking it fails to open the full interface (the window cannot be enlarged, maximized, or interacted with norma...
Press Ctrl + Shift + Esc to open Task Manager.
Find Windows Explorer in the list.
Right-click on Windows Explorer and select Restart.
Wait a moment for the desktop and taskbar to refresh.
Try opening Task Manager again.
KB:5074109 installed 14-1-2026 give problems such as Freeze of Windows - Black screen with arrow - lost Lan and so on.
KB:5078127 should fix the probles you got with KB:5074109 and installed on 25-1-2026 .
I don't know of task bar not operational any more is still there after KB:5078127.
I also had probles with the task bar: Google not opening - Task Manager not opening - icons blank and not with for exaple the Intel driver support Icon.
I have to wait if the problems are dissappeard.
Regards, Andre