Any idea what's causing this weird windows explorer bug, to appear black background for folders.
Is this due to change of some system settings?
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This can be fixed by making use of a simple .bat file reset thumbnail cache files. For that purpose, open the Notepad and then copy and paste the following code:
@echo off taskkill /f /im explorer.exe timeout 2 /nobreak>nul echo. DEL /F /S /Q "%LocalAppData%\IconCache.db" DEL /F /S /Q "%LocalAppData%\Microsoft\Windows\Explorer\iconcache_*.db" DEL /F /S /Q "%LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*.db" timeout 2 /nobreak>nul start explorer.exe
Save the file in .bat format. Double click to run the program. This will also restart Windows explorer, so your screen might go blank for some moments. After that, you should no longer face this issue again.
For more information and methods, see this: How to Fix Black Background Behind Folder Icons in Windows 10