As the subject says, it works the first few clicks, or keystrokes. Then stops working. i.e. you can see the cursor moving over the folders, but the folders/files can't be selected. Cannot open the files/folders by [ENTER] key, or right click, Open, or double-click. Closing the window and starting another one, fixes it for a clicks, then same thing all over again. No issues as root.
Wonder if I a recent upgrade caused this, don't remember encountering this problem before.