I’mt not running Mint but I noticed it recently (second icon from right side):
@daniel.pan - sorry, don’t know who is responsible for the Seafile client. 
1 Like
The applet doesn’t appear at all on my system - which is Linux Mint 18.1 Cinnamon x64. I think that this is a fairly long-standing problem, complained about elsewhere. It seems a pretty serious problem to me,
1 Like