Comment 8 for bug 1309841

THANK YOU !

I installed compton in Lubuntu, disabled shadow and it works PERFECTLY ! (i mean, no black square anymore)

Here is the detailed explanations : http://askubuntu.com/questions/451095/lubuntu-14-04-and-fcitx-qimpanel-how-to-remove-this-black-square/451285#451285

thanks again for your support ! cheers.