Latest build of Insider Preview Build 18362.19h1_release.190318-1202
If you roll a fence down, or double click it, Windows Explorer will hang and make the screen go white and automatically restart explorer.exe and fences. The only current solution is to "disable fences" and manually recreate a similar folder/icon structure manually with Windows Explorer folders.
explorer.exe seems to be hung in a call to DesktopDock64.dll at the time of the crash. Let me know if you want Explorer WER files