I'm running Lubuntu with LXDE. When I double-click on a folder on the desktop, it does not open. The read/write settings are correct. Any idea what I could do?
Try uninstalling Nautilus if you have it installed and see if then it would work. Nautilus tends to take over the desktop sometimes in Lubuntu and Xubuntu, and even after recovering from this, certain problems like that reported may linger for some time.