Black "marking cursor" on the upper left corner

[mindchanger]

Hey folks.

I've got some serious problems with an debian 7 and LXDE on a bananapi pro.

Everything works fine so far, excepting one annyoing thing:
there's a black cursor, one of these when you marking some text, in the area of the upper left corner. It overlays everything. If I restart the lxsession it's gone away but that can't be a solution.
Have a look at the pics.

When you hover over it with the cursors it's going away for a piece of a second and appears again.

Does anyone have an idea?

Thanks for your support.

Marius

[mindchanger]

found the solution today.

Reason for this is the package "fbi" which is made for a splash-screen pic.
apt-get remove fbi leads to the solution.

[mindchanger]

please close... thx