I think I found the responsible program for the progress indicators: "Actual Window Manager" . Luckily it was enough to create an exception for dopus, because uninstallation wasn't an option since I'm depending on this program for my work. Of course I abandoned a lot of the functionality I had with v.12 (roll up, stay on top, transparency, resizing, alignment and so on). However the url problem remains. If by accident the mouse arrow points on a url (while the viewer is open) and somebody tries to delete it or make any folder change, dopus freezes. The viewer cannot be closed and the action cannot be cancelled. It's necessary to use the task manager to shut down dopus. By the way, the urls cannot be loaded in viewer - there is a message "loading" and nothing happens