Solution:
Root Cause: Thumbnail Preview and Shell Extension Crash (explorerframe.dll Failure)
When dragging an item over a taskbar icon, Windows triggers live thumbnail preview rendering via Desktop Window Manager (dwm.exe) and explorerframe.dll. If custom preview handlers, shell overlays, or outdated display driver hooks encounter an unhandled exception during this hover event, explorer.exe crashes and restarts instantly, aborting the drag operation.
Diagnostic Verification:
Open Event Viewer (eventvwr.msc) and check Windows Logs > Application.Filter for Event ID 1000 (Application Error) and check if Faulting module name points to explorerframe.dll, twinui.pcshell.dll, or a third-party graphics DLL.Step-by-Step Fix:
1Rebuild Icon and Thumbnail Cache:
Open PowerShell as Administrator.Stop the Explorer process and purge cache files by executing: Stop-Process -Name explorer -Force
Remove-Item -Path "$env:LOCALAPPDATA\IconCache.db" -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:LOCALAPPDATA\Microsoft\Windows\Explorer\thumbcache_*.db" -Force -ErrorAction SilentlyContinue
Start-Process explorer.exe
2Update or Perform Clean Installation of Display Drivers:
Download the latest official display drivers for your GPU (NVIDIA, AMD, or Intel).Install the driver using the 'Perform a clean installation' option to replace corrupted DirectX/DWM overlay hooks.3Disable Taskbar Animations and Previews Temporarily:
Press Win + R, type sysdm.cpl, and press Enter to open System Properties.Go to the Advanced tab and click Settings under *Performance*.Uncheck Animate controls and elements inside Windows and Show thumbnails instead of icons.Click Apply and OK.Prevention & Long-Term Monitoring:
Maintain GPU drivers up to date to ensure stable DWM thumbnail compositing.