Can't Click Above Your Taskbar? Here's Why!

Hey, it's Shiichan! Today's story is about a subtle but annoying bug on Windows 11 laptops. If you've ever wondered why you can't drag-select icons near the top of your desktop, this might be why.

What was announced?

This comes from the JP Windows Support blog (Microsoft Japan's Windows Support team). On non-convertible Windows 11 laptops (regular clamshell devices whose screens don't rotate or detach), a strip of area just above the taskbar can become unresponsive to mouse input. Inside that strip, you can't do things like drag-select desktop icons.

Why it matters

The cause is two issues layered on top of each other.

The first: since February 2023, Windows 11 adjusts the taskbar's height when the screen expands, on the assumption that the device is a tablet-capable "convertible." If the registry value ConvertibleSlateModeChanged=1 is set, even on an ordinary laptop, the OS treats the device as convertible and this behavior kicks in.

The second: a bug introduced in the January 2026 preview updates for Windows 11 version 24H2 / 25H2. When Sysprep runs, the OS misreads the removal of the ConvertibleSlateMode registry value as a hardware posture change, and automatically sets ConvertibleSlateModeChanged=1. If Sysprep is run with CopyProfile, that flag then carries over into newly created user profiles too.

What changes

Now that the cause is known, administrators can build a preventive step into their image creation process. And for environments where it's already happening, deleting the relevant registry value fixes it, so nobody has to keep chasing an unexplained UI glitch.

Dive Deep

The post covers three scenarios.

To prevent it when building a new image, sign in as an administrator, run the command below, restart Explorer to confirm the flag is gone, then run Sysprep as usual.

reg delete "HKLM\SYSTEM\CurrentControlSet\Control\PriorityControl" /v ConvertibleSlateMode /f

To fix an environment where it's already happening, run the command below as the affected user, then sign out and back in.

reg delete "HKCU\Software\Microsoft\TabletTip\ConvertibleSlateModeChanged" /v ConvertibleSlateModeChanged /f

To fix the default profile, mount the default user's registry hive with administrator privileges and delete the same flag from it.

If your team builds new images regularly, it's worth wiring the prevention command into your process before running Sysprep.

Wrap-up

• Non-convertible Windows 11 laptops can lose mouse interaction in a strip just above the taskbar
• The cause is a mis-set convertible-detection registry value combined with a Sysprep bug that misreads a posture change
• Deleting the ConvertibleSlateMode / ConvertibleSlateModeChanged registry values prevents and fixes it
• Environments that build images with Sysprep's CopyProfile option are especially at risk

If you manage Windows 11 image deployment or device kitting, this one's worth checking!