System Tray Icon Disappeared after Win 8.1 update

[jbringer]

Hello,

I have a serious problem. On my Vaio Laptop I did the very last Win 8.1 Update.
Since there the display link system icon disapeared and cannot be reactivated. If I try to reactivate it in the system tray it says "Symbol is not active".
Everything is working with the displayunit (Lan, Sound, Keybord, Mouse) but the display is not switching to my big monitor. And I cannot swich the device to the monitor since the system try icon disappaered.
I tried to unistall the whole display link software and clean it with your cleaning tool and then install the newest driver version 7.7 m2 times several time.
But no chance. I tried it on another display link since I have another workstation. Same problem.
The display link is not switching the grafic option to the big monitor.
Before I worked with it without any problems since more than half of a year. I had only once the same problem after an update of win, bt that was solved after installing the latest driver version (there it was 7.4 m2).

Please help...I really don't know to handle the problem and reactivate the system tray to switch the device. And I need to work with it.

Thanks