This problem has persisted for several months but it comes up periodically. My temporary fix is to restart but I've gotten annoyed.
When I click on a folder, it starts but when I start up explorer.exe itself, it wont work. Also when I right click on a folder or file, it crashes explorer and restarts it.
I've tried restarting the process and chosen the Launch Folder In Different Process and always use Icons, Never Thumbnails.
I have tried disabling shell extensions with third party software but no luck.