Hmm, on my PC I can't reproduce this, but I see that the "sharing config" UI is drawn other on the PC's browser than on my tablet - might be that this confused me: On the tablet view I don't see each side (read only | read/write) a big text area showing the names of the sharing members , but each a selector, showing the text "0 ausgewählt". When selecting such, I get a dialog on top of the "Share list" dialog, showing the names of shared members.