I have similar problem. I have many folder portal and all of them are ok but one.
Before this it was another folder portal that shows empty folder, so I uninstall and clean fences. After new installation folder portal Project 2 is shown empty but its not.
When I double click on portal I get proper folder with data inside
I already try to uninstall and install again, I hope that you have another solution than this?
Windows: Version 2004 - OS Build 19041.804
When I delete portal and recreate it again holding alt on keyboard it is ok until reboot of PC.
Any thoughts on this crazy issue