My laptop is connected to a ThinkPad Mini Dock Series 3 with external monitor, keyboard and mouse. Ever since I upgraded from W7 to W10 I've had a problem where whenever I boot up my laptop or restart it, I can't use the arrow buttons in File Explorer to go to last/previously visited folder. I also can't use the Windows-key on my external keyboard to access the Start-menu.
To fix the problem I have to use the laptop keyboard/touchpad to either press down the Windows-key or navigate to a folder and use the arrow buttons before it will work on my external devices. Is there any way to fix this so it will work on my external devices instantly?

Things I have tried to do are:

- Reinstall all Windows-apps using Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
- Adding "EnableXAMLStartMenu" as a DWORD-value in RegEdit

- Running "sfc /scannow" in CMD

- Change external keyboard

- Changed monitor cable from DisplayPort to DVI

- Change Docking-station

- Clean installing W10, since I originally just upgraded from W7 to W10

None of the above didn't work, and it's starting to get quite annoying now.