I have the same issue, but with only one of my folders. And if I copy that same folder to another Win 8.1 machine I do not have the issue opening the folder on the other machine. I don't know why the behavior would be different on different machines. Perhaps I need to compare the folder properties when I get a chance.
thanks
It is probably a security feature. Folder contents aren’t browse-able until an authenticated user initiates indexing via the click. Try turning on the indexing service. That should pre-index the folders at the system level. User authentication would then only apply to accessing the folders, rather than indexing them first before accessing them.