All my mounted drives doesn't appear on my Desktop. It is definitely mounted but simply not visible. I can still navigate to the location in the /media/...

It is not a major problem but very inconvenient because I have to unmount them from the terminal each time. The problem started after I experimented with liveusb. At first, the problem only appears when I run liveusb but afterwards the behaviour persist even when liveusb are not running. Does anybody has an idea how to solve this?

Thanks in advance.