Known issues
There is one known issue that unfortunatly I can do little about.
Blanking / flicker on window restore or call up.
When the window is called up from the tray it maybe blank for a second before it populates. This may also happen when the window is open and switched away from for a while. This is a WebKitGTK quirk that I cannot fix. I do though do my best to try to counter this in groktray itself, but it isn't perfect.