I'm running Ubuntu 16.10, and every time I start up I get an app-indicator in systemtray that I don't know what is. It appears in guestsession as well.
It's the one right left of the wifi symbol:
When I pres it, it produces a kind of blank black menu with no text. I guess it's a leftover from a removed program, but I can't recall which. Any1 that can help?