Why is there upload traffic, even if i do not upload files at that moment ?

Since i uploaded some files i permanently have a upload rate of up to (the value i selected in options menu) KB/s, even if i do not upload files (Whats that upload traffic for?)

And... the clear list function of "Downloads" Windows does not work. If i restart Wuala the files will be displayed again...

anyone an idea on how to fix these problems ?
 
indifferent I’m confused
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