I can't seem to figure out how to get the Folder Tree to show all the time is can be shown. For instance, if I open the Control Panel (which have no folder tree!?), and I then go back to another lister, the Folder Tree does not come back.
You probably got it by dragging the Control Panel folder onto the toolbar. Strange that it closes the tree, though. Are you sure it isn't opening another window without a tree and leaving the old window behind?
Anyway, changing the button to "go /controls" should solve the problem.
Nudel, I must sheepishly admit that it actually does open another window. I feel like a real idiot. I always continued working in the Dopus version that opened the Control Panel, and I never noticed that the earlier version was still open (until much later, and then I did not make the connection).